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12-x=8x-42

show all the steps and everything

2006-12-11 13:17:22 · 11 answers · asked by Anonymous in Science & Mathematics Mathematics

11 answers

12-x=8x-42
12=9x-42
54=9xx=6
1)add x to both sides, you want the same terms on the same side
2)add 42 to both sides, you add the x and the 42 because that's the opp. of -
3)divide 54 by 9 because now you want to get the x by itself, seeing as how your solving for that

2006-12-11 13:32:12 · answer #1 · answered by Anonymous · 0 0

12 - x = 8x - 42

Add x to each side

12 -x + x = 8x - 42

Add 42 from bothsides

12 + 42 -x + x = 8x - 42 + 42
54 = 8X

divide both sides by 9

54/9 = 9x/9
x = 54/9 = 6

2006-12-11 21:23:58 · answer #2 · answered by Anonymous · 0 0

12-x=8x-42
+x +x Cancel out negative x by making it positive. Then adding to x on other side.

12=9x-42
+42 +42 Do the same to 42.

54/9=9/9x Divide by 9 to get x by itself.
x=6

2006-12-11 21:55:45 · answer #3 · answered by Anonymous · 0 0

the steps I do are in ( ) on both sides

12 - x (+ x) = 8x - 42 (+x) add x to both sides which leaves:
12 = (8+1)x - 42
12 = 9x - 42

12 (+42) = 9x - 42 (+42) leaving:
54 = 9x

54(/9) = 9x(/9)

54/9 = x = 6

2006-12-11 21:21:20 · answer #4 · answered by Modus Operandi 6 · 0 0

12-x=8x-42
8x-42=12-x
8x+x=12+42
9x = 54

x = 6

2006-12-11 21:24:04 · answer #5 · answered by Luiz S 7 · 0 0

12-x=8x-42
-x=8x-54<---subtract 12 from both sides
-9x=-54<---subtract 8x from both sides
x=6<---divide both sides by -9

2006-12-11 21:21:17 · answer #6 · answered by d.treadway 2 · 0 0

12-x=8x-42 add x to each side
12=9x-42 add 42 to each side
54=9x divide by 9
x=6

2006-12-11 21:20:39 · answer #7 · answered by yupchagee 7 · 0 0

12-x=8x-42
12+42=8x+x
54=9x
x=54/9
x=6

2006-12-11 22:05:48 · answer #8 · answered by sam 3 · 0 0

12-x=8x-42
12+42-x=8x
54-x=8x
54=9x
54/9=x
x=6

2006-12-11 21:28:11 · answer #9 · answered by SRM 1 · 0 0

54= 9x

x = 54/9

x = 6

2006-12-11 21:20:58 · answer #10 · answered by Anonymous · 0 0

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