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3(7-3x)+8(2-2x=12
We move all terms to the left:
3(7-3x)+8(2-2x-(12)=0
We add all the numbers together, and all the variables
3(-3x+7)+8(2-2x-12=0
We multiply parentheses
-9x+8(2-2x-12+21=0
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