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-5x+7(3x-12)=12
We move all terms to the left:
-5x+7(3x-12)-(12)=0
We multiply parentheses
-5x+21x-84-12=0
We add all the numbers together, and all the variables
16x-96=0
We move all terms containing x to the left, all other terms to the right
16x=96
x=96/16
x=6
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