2007-06-03 23:10:29 · 19 answers · asked by team r 1 in Science & Mathematics ➔ Mathematics
I hate equations! took GCSE maths twice and had private tuition and still didnt get the hang of them.....
2007-06-03 23:17:45 · answer #1 · answered by ondballpaul 3 · 0⤊ 0⤋
3x -12= 9
3x = 9 + 12
3x = 21 divide by 3
x = 7
2007-06-03 23:34:54 · answer #2 · answered by muhamed a 4 · 0⤊ 0⤋
X = 7
2007-06-03 23:26:10 · answer #3 · answered by Mr. G 2 · 0⤊ 0⤋
7
2007-06-04 04:05:39 · answer #4 · answered by motown 5 · 0⤊ 0⤋
3x-12 = 9
take the 12 to other side of the equation -12 will change its sign and become + 12 to get
3x = 9 + 12
3x = 21
x = 21/3
x = 7
2007-06-03 23:22:31 · answer #5 · answered by Sam 2 · 0⤊ 0⤋
3x = 12 + 9. 3x = 21. x = 21/3. x = 7.
2007-06-03 23:13:54 · answer #6 · answered by Anonymous · 1⤊ 0⤋
3x - 12 = 9
3x = 9 + 12 = 21
x = 21/3 = 7
x = 7
2007-06-03 23:16:08 · answer #7 · answered by Swamy 7 · 0⤊ 0⤋
3x = 9+12
You have to transpose 12 to the right side first so you sort out the numbers since you can't sort out with the numbers having a variable. Change the sign of the number as you transpose it to another side.
3x=21
_ _
3 3
Divide the number that precedes to the variable to both sides coz in the end, the variable must have no numerical partner at all.
x=7
And so goes with your final answer. Therefore x=7.
2007-06-03 23:15:12 · answer #8 · answered by Anonymous · 0⤊ 0⤋
3x = 9 +12
x= 21/3 =7
2007-06-03 23:14:21 · answer #9 · answered by Anonymous · 0⤊ 0⤋
cancel the 12 by adding 12 to each side
so 3x =9+12
3x = 21
21/3 = x
x=7
2007-06-03 23:18:51 · answer #10 · answered by Icarus 6 · 0⤊ 0⤋
3x=12+9
3x=21
x=21/3=7
2007-06-03 23:19:55 · answer #11 · answered by ~*tigger*~ ** 7 · 0⤊ 0⤋