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-3(x+72)=171
We move all terms to the left:
-3(x+72)-(171)=0
We multiply parentheses
-3x-216-171=0
We add all the numbers together, and all the variables
-3x-387=0
We move all terms containing x to the left, all other terms to the right
-3x=387
x=387/-3
x=-129
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