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3(x-7)=2x+81
We move all terms to the left:
3(x-7)-(2x+81)=0
We multiply parentheses
3x-(2x+81)-21=0
We get rid of parentheses
3x-2x-81-21=0
We add all the numbers together, and all the variables
x-102=0
We move all terms containing x to the left, all other terms to the right
x=102
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