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5x+40=3x-20
We move all terms to the left:
5x+40-(3x-20)=0
We get rid of parentheses
5x-3x+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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