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5x-40=2x+20
We move all terms to the left:
5x-40-(2x+20)=0
We get rid of parentheses
5x-2x-20-40=0
We add all the numbers together, and all the variables
3x-60=0
We move all terms containing x to the left, all other terms to the right
3x=60
x=60/3
x=20
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