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3x+2(x+13)=66
We move all terms to the left:
3x+2(x+13)-(66)=0
We multiply parentheses
3x+2x+26-66=0
We add all the numbers together, and all the variables
5x-40=0
We move all terms containing x to the left, all other terms to the right
5x=40
x=40/5
x=8
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