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-5(2x-4)=80
We move all terms to the left:
-5(2x-4)-(80)=0
We multiply parentheses
-10x+20-80=0
We add all the numbers together, and all the variables
-10x-60=0
We move all terms containing x to the left, all other terms to the right
-10x=60
x=60/-10
x=-6
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