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6x+3(4x+18)=-108
We move all terms to the left:
6x+3(4x+18)-(-108)=0
We add all the numbers together, and all the variables
6x+3(4x+18)+108=0
We multiply parentheses
6x+12x+54+108=0
We add all the numbers together, and all the variables
18x+162=0
We move all terms containing x to the left, all other terms to the right
18x=-162
x=-162/18
x=-9
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