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3x-20=4x-80
We move all terms to the left:
3x-20-(4x-80)=0
We get rid of parentheses
3x-4x+80-20=0
We add all the numbers together, and all the variables
-1x+60=0
We move all terms containing x to the left, all other terms to the right
-x=-60
x=-60/-1
x=+60
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