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6(3+6x)=-90
We move all terms to the left:
6(3+6x)-(-90)=0
We add all the numbers together, and all the variables
6(6x+3)-(-90)=0
We add all the numbers together, and all the variables
6(6x+3)+90=0
We multiply parentheses
36x+18+90=0
We add all the numbers together, and all the variables
36x+108=0
We move all terms containing x to the left, all other terms to the right
36x=-108
x=-108/36
x=-3
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