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27=-3(x+12)
We move all terms to the left:
27-(-3(x+12))=0
We calculate terms in parentheses: -(-3(x+12)), so:We get rid of parentheses
-3(x+12)
We multiply parentheses
-3x-36
Back to the equation:
-(-3x-36)
3x+36+27=0
We add all the numbers together, and all the variables
3x+63=0
We move all terms containing x to the left, all other terms to the right
3x=-63
x=-63/3
x=-21
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