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9(12-3x)=-216
We move all terms to the left:
9(12-3x)-(-216)=0
We add all the numbers together, and all the variables
9(-3x+12)-(-216)=0
We add all the numbers together, and all the variables
9(-3x+12)+216=0
We multiply parentheses
-27x+108+216=0
We add all the numbers together, and all the variables
-27x+324=0
We move all terms containing x to the left, all other terms to the right
-27x=-324
x=-324/-27
x=+12
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