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12-9x=2x-12+x
We move all terms to the left:
12-9x-(2x-12+x)=0
We add all the numbers together, and all the variables
-9x-(3x-12)+12=0
We get rid of parentheses
-9x-3x+12+12=0
We add all the numbers together, and all the variables
-12x+24=0
We move all terms containing x to the left, all other terms to the right
-12x=-24
x=-24/-12
x=+2
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