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2x+2(x+1)=82
We move all terms to the left:
2x+2(x+1)-(82)=0
We multiply parentheses
2x+2x+2-82=0
We add all the numbers together, and all the variables
4x-80=0
We move all terms containing x to the left, all other terms to the right
4x=80
x=80/4
x=20
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