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4(2x+4)=80
We move all terms to the left:
4(2x+4)-(80)=0
We multiply parentheses
8x+16-80=0
We add all the numbers together, and all the variables
8x-64=0
We move all terms containing x to the left, all other terms to the right
8x=64
x=64/8
x=8
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