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3x-40=x+20=x
We move all terms to the left:
3x-40-(x+20)=0
We get rid of parentheses
3x-x-20-40=0
We add all the numbers together, and all the variables
2x-60=0
We move all terms containing x to the left, all other terms to the right
2x=60
x=60/2
x=30
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