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7x+2(x-6)=15
We move all terms to the left:
7x+2(x-6)-(15)=0
We multiply parentheses
7x+2x-12-15=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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