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-3(8+x)=57
We move all terms to the left:
-3(8+x)-(57)=0
We add all the numbers together, and all the variables
-3(x+8)-57=0
We multiply parentheses
-3x-24-57=0
We add all the numbers together, and all the variables
-3x-81=0
We move all terms containing x to the left, all other terms to the right
-3x=81
x=81/-3
x=-27
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