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18=-3(4x+6)
We move all terms to the left:
18-(-3(4x+6))=0
We calculate terms in parentheses: -(-3(4x+6)), so:We get rid of parentheses
-3(4x+6)
We multiply parentheses
-12x-18
Back to the equation:
-(-12x-18)
12x+18+18=0
We add all the numbers together, and all the variables
12x+36=0
We move all terms containing x to the left, all other terms to the right
12x=-36
x=-36/12
x=-3
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