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x+2(x-12)+3(x-6)=126
We move all terms to the left:
x+2(x-12)+3(x-6)-(126)=0
We multiply parentheses
x+2x+3x-24-18-126=0
We add all the numbers together, and all the variables
6x-168=0
We move all terms containing x to the left, all other terms to the right
6x=168
x=168/6
x=28
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