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-(18+6x)=6(1+3
We move all terms to the left:
-(18+6x)-(6(1+3)=0
We add all the numbers together, and all the variables
-(6x+18)-(64=0
We add all the numbers together, and all the variables
-(6x+18)=0
We get rid of parentheses
-6x-18=0
We move all terms containing x to the left, all other terms to the right
-6x=18
x=18/-6
x=-3
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