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80=4x-20
We move all terms to the left:
80-(4x-20)=0
We get rid of parentheses
-4x+20+80=0
We add all the numbers together, and all the variables
-4x+100=0
We move all terms containing x to the left, all other terms to the right
-4x=-100
x=-100/-4
x=+25
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