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-18-3x=-6(x+7)
We move all terms to the left:
-18-3x-(-6(x+7))=0
We calculate terms in parentheses: -(-6(x+7)), so:We get rid of parentheses
-6(x+7)
We multiply parentheses
-6x-42
Back to the equation:
-(-6x-42)
-3x+6x+42-18=0
We add all the numbers together, and all the variables
3x+24=0
We move all terms containing x to the left, all other terms to the right
3x=-24
x=-24/3
x=-8
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