find x.
i need help. formula aswell
2006-12-29 06:59:25 · 22 answers · asked by Sarah I 2 in Education & Reference ➔ Homework Help
well the x's are like terms, so you just subtract them:
12x - 9x = 3x
You subtract the 6 from both sides like this:
3x + 6 - 6 = 21 - 6
which simplified is:
3x = 15
so x = 15 / 3 which is 5.
2006-12-29 07:02:33 · answer #1 · answered by Anonymous · 0⤊ 0⤋
5
2006-12-29 07:01:59 · answer #2 · answered by UNI Panther 3 · 0⤊ 0⤋
x=5
2006-12-29 10:39:24 · answer #3 · answered by roostergirl32 2 · 0⤊ 0⤋
x=5
2006-12-29 07:09:49 · answer #4 · answered by icu 6 · 0⤊ 0⤋
12x-9x+6=21
3x+6=21
3x+6-6=21-6
3x=15
3x/3=15/3
x=5
ok, subtract 9 from12 because they are like terms.
you are left with 3x+6=21.
group like terms by putting the 6 on the other side with the 21(they are like terms)
to move a positive # or varialble u must do the opposite to adding_subtract
what u do on one side u must do on the other, so subtract 6 from the 6 ( leaving nothin except 3x) then subtract the 6 from the 21 on the other side.
you now have 3x=15
you divide by the # infront of the x which is 3. what u do on one side u must do onthe other side
3x divided by 3 =x
15 divided by 3=5
therfore x=5
you're welcome!
2006-12-29 09:45:01 · answer #5 · answered by REALITY 2 · 0⤊ 0⤋
U want to isolate x right?
12x-9x+6=21 combine like terms
3x+6=21 combine like terms accross the = sign
-6 -6
------------
3x=15 divide by 3 on both sides to isolate x
--- ----
3 3
x=5
2006-12-29 07:05:31 · answer #6 · answered by Anonymous · 0⤊ 0⤋
12x-9x+6=21
3x+6=21
3x+6-6=21-6
3x/3=15/3
x=5
Good Luck!!!
2006-12-29 07:02:27 · answer #7 · answered by Anonymous · 0⤊ 0⤋
I think:
12x-9x+6=21
you can combine the "x-es"
3x+6=21
3x=21-6
3x=15
x=5
2006-12-29 07:03:04 · answer #8 · answered by Tiff 5 · 0⤊ 0⤋
first u should subtract
12x-9x= 3x
then u get
3x+6=21
do the opposite of additiion which is subtraction
21-6=15
then u get 3x=15
opposite of multiplication is division
15/3= 5
x=5
theres ur answer
2006-12-29 08:27:14 · answer #9 · answered by Valerie 2 · 0⤊ 0⤋
a million. 14x-3(3x-6)=21-x+37 multiply -3 by each little thing contained in the 14x-9x+18=fifty 8-x parenthesis and upload 21 and 37 5x+18=fifty 8-x upload 14x and -9 -18 -18 bypass the 18 to the different aspect 5x=40-x bypass the -x to the different aspect +x +x 6x=40 6x/6=40/6 divide both aspect by 6 x=6 2/3 2. 5x+18=a million/2(fifty six-12x)+26-7x 5x+18=28-6x+26-7x multiply a million/2 by each little thing in 5x+18=fifty 4-13x upload like words +13x +13x bypass -13 to the different aspect 18x+18=fifty 4 -18 -18 bypass -18 to the different aspect 18x=36 18x/18=36/18 divide both aspect by 18 x=2
2016-12-01 07:35:29 · answer #10 · answered by ? 4 · 0⤊ 0⤋