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-9x+42=-12x
We move all terms to the left:
-9x+42-(-12x)=0
We get rid of parentheses
-9x+12x+42=0
We add all the numbers together, and all the variables
3x+42=0
We move all terms containing x to the left, all other terms to the right
3x=-42
x=-42/3
x=-14
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