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12=2x-12+6x
We move all terms to the left:
12-(2x-12+6x)=0
We add all the numbers together, and all the variables
-(8x-12)+12=0
We get rid of parentheses
-8x+12+12=0
We add all the numbers together, and all the variables
-8x+24=0
We move all terms containing x to the left, all other terms to the right
-8x=-24
x=-24/-8
x=+3
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