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2(10x-7)=66
We move all terms to the left:
2(10x-7)-(66)=0
We multiply parentheses
20x-14-66=0
We add all the numbers together, and all the variables
20x-80=0
We move all terms containing x to the left, all other terms to the right
20x=80
x=80/20
x=4
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