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10x-20=5x+20
We move all terms to the left:
10x-20-(5x+20)=0
We get rid of parentheses
10x-5x-20-20=0
We add all the numbers together, and all the variables
5x-40=0
We move all terms containing x to the left, all other terms to the right
5x=40
x=40/5
x=8
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