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-3x-3(5x-15)=81
We move all terms to the left:
-3x-3(5x-15)-(81)=0
We multiply parentheses
-3x-15x+45-81=0
We add all the numbers together, and all the variables
-18x-36=0
We move all terms containing x to the left, all other terms to the right
-18x=36
x=36/-18
x=-2
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