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9(12+x)=135
We move all terms to the left:
9(12+x)-(135)=0
We add all the numbers together, and all the variables
9(x+12)-135=0
We multiply parentheses
9x+108-135=0
We add all the numbers together, and all the variables
9x-27=0
We move all terms containing x to the left, all other terms to the right
9x=27
x=27/9
x=3
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