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9x-20=5x+20
We move all terms to the left:
9x-20-(5x+20)=0
We get rid of parentheses
9x-5x-20-20=0
We add all the numbers together, and all the variables
4x-40=0
We move all terms containing x to the left, all other terms to the right
4x=40
x=40/4
x=10
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