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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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