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18+(3x+6)=-x
We move all terms to the left:
18+(3x+6)-(-x)=0
We add all the numbers together, and all the variables
(3x+6)-(-1x)+18=0
We get rid of parentheses
3x+1x+6+18=0
We add all the numbers together, and all the variables
4x+24=0
We move all terms containing x to the left, all other terms to the right
4x=-24
x=-24/4
x=-6
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