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2(2x)+4(x+1)=80
We move all terms to the left:
2(2x)+4(x+1)-(80)=0
We multiply parentheses
22x+4x+4-80=0
We add all the numbers together, and all the variables
26x-76=0
We move all terms containing x to the left, all other terms to the right
26x=76
x=76/26
x=2+12/13
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