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2x-20=12x-80
We move all terms to the left:
2x-20-(12x-80)=0
We get rid of parentheses
2x-12x+80-20=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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