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6x+18=-3(x+6)
We move all terms to the left:
6x+18-(-3(x+6))=0
We calculate terms in parentheses: -(-3(x+6)), so:We get rid of parentheses
-3(x+6)
We multiply parentheses
-3x-18
Back to the equation:
-(-3x-18)
6x+3x+18+18=0
We add all the numbers together, and all the variables
9x+36=0
We move all terms containing x to the left, all other terms to the right
9x=-36
x=-36/9
x=-4
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