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3x+5(-6x-18)=-306
We move all terms to the left:
3x+5(-6x-18)-(-306)=0
We add all the numbers together, and all the variables
3x+5(-6x-18)+306=0
We multiply parentheses
3x-30x-90+306=0
We add all the numbers together, and all the variables
-27x+216=0
We move all terms containing x to the left, all other terms to the right
-27x=-216
x=-216/-27
x=+8
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