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-6+7x=4x+12
We move all terms to the left:
-6+7x-(4x+12)=0
We get rid of parentheses
7x-4x-12-6=0
We add all the numbers together, and all the variables
3x-18=0
We move all terms containing x to the left, all other terms to the right
3x=18
x=18/3
x=6
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