how do you do that with working out
2006-10-07 08:42:44 · 13 answers · asked by mojo jojo 1 in Science & Mathematics ➔ Mathematics
7x+2+3x+9=7x+20
7x+3x+2+9=7x+20
10x+11=7x+20
10x-7x=20-11
3x=9
x=9/3
x=3
2006-10-07 08:49:17 · answer #1 · answered by Anonymous · 0⤊ 0⤋
7x+2+3x+9=7x+20
7x + 3x = 10x
10x+2+9=7x+20
10x - 7x = 3x
3x+2+9 = 20
2+9 = 11
20 -11 = 9
3x = 9
divide 3 on both sides
x = 3
2006-10-10 21:18:08 · answer #2 · answered by ♥KiYa♥ 3 · 0⤊ 0⤋
7x+2+3x+9=7x+20 => -7x from both sides
2+3x+9=20 => -2-9 from both sides
3x=20-2-9 => /3
x=3
2006-10-07 17:15:55 · answer #3 · answered by Anonymous · 0⤊ 0⤋
7X + 2 + 3X + 9 = 7X + 20
Subtract 7X from each side:
2 + 3X + 9 = 20
Add the non-variable numbers on the left side:
3X + 11 = 20
Subtract 11 from both sides:
3X = 9
Divide both sides by 3:
X = 3
2006-10-07 15:51:58 · answer #4 · answered by SShenold 2 · 0⤊ 0⤋
First combine the like terms
10x+11=7x+20
then balance the equation
10x+11=7x+20
-7x -7x
3x+11=20
-11 -11
3x=9
then divide each side by 3
x=3
there's your answer
2006-10-07 15:51:01 · answer #5 · answered by Choad McChump 1 · 0⤊ 0⤋
Get rid of the 7x on both sides. Get rid of the 2 and 9 both sides. Leaves you with 3x=9 Which leaves 3x divided by 3 and 9 divided by 3 which leave x=3
2006-10-07 15:48:19 · answer #6 · answered by The Druid 4 · 0⤊ 0⤋
7x+2+3x+9=7x+20 subtract 7x from each side
7x+3x-7x+2+9=7x-7x+20
3x+11=20 subtract 11 from each side
3x+11-11=20-11
3x=9 divide each side by 3
3x/3=9/3
x=3
2006-10-09 20:55:26 · answer #7 · answered by yupchagee 7 · 0⤊ 0⤋
7x+2+3x+9=7x+20
First cross out the 7x on both sides.
= 2+3x+9=20
Now add 2 and 9 together and take the answer from 20.
2+9=11
20-11=9
Therefore 3x=9.
divide each side by 3 and that gives you x=3.
2006-10-07 15:59:12 · answer #8 · answered by Anonymous · 0⤊ 0⤋
you must combine like variables:
7x+2+3x+9=7x+20 (combine the 7x and the 3x, combine 2+9)
10x+11=7x+20 (subtract 7x from both sides)
3x+11=20 (subtract eleven from both sides)
3x=9 (divide both sides by 3)
x=3
2006-10-07 15:54:01 · answer #9 · answered by dancinda 3 · 0⤊ 0⤋
7x+2+3x+9=7x+20
first combine variables:
10x+2+9=7x+20
now do the number additions:
10x+11=7x+20
now isolate your variables:
10x-7x+11=7x-7x+20
3x+11=20
Now subtract 11 from both sides:
3x+11-11=20-11
3x=9
Now divide both sides by 3:
3x/3=9/3
x=3
2006-10-08 16:13:43 · answer #10 · answered by Melanie G 1 · 0⤊ 0⤋
7x+3x+2+9=7x+20
combine like terms...
10x+11=7x+20
take away 7x from either side...
3x+11=20
take away 11 from either side...
3x=9
divide either side by 3...
x=3
2006-10-07 16:36:07 · answer #11 · answered by bRWnEyEdGiRL 2 · 0⤊ 0⤋