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12-6x=-3x+9x
We move all terms to the left:
12-6x-(-3x+9x)=0
We add all the numbers together, and all the variables
-6x-(+6x)+12=0
We get rid of parentheses
-6x-6x+12=0
We add all the numbers together, and all the variables
-12x+12=0
We move all terms containing x to the left, all other terms to the right
-12x=-12
x=-12/-12
x=1
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