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9x-20=5x+40
We move all terms to the left:
9x-20-(5x+40)=0
We get rid of parentheses
9x-5x-40-20=0
We add all the numbers together, and all the variables
4x-60=0
We move all terms containing x to the left, all other terms to the right
4x=60
x=60/4
x=15
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