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12-x=-3x+6
We move all terms to the left:
12-x-(-3x+6)=0
We add all the numbers together, and all the variables
-1x-(-3x+6)+12=0
We get rid of parentheses
-1x+3x-6+12=0
We add all the numbers together, and all the variables
2x+6=0
We move all terms containing x to the left, all other terms to the right
2x=-6
x=-6/2
x=-3
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