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20x-10=5x+15
We move all terms to the left:
20x-10-(5x+15)=0
We get rid of parentheses
20x-5x-15-10=0
We add all the numbers together, and all the variables
15x-25=0
We move all terms containing x to the left, all other terms to the right
15x=25
x=25/15
x=1+2/3
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