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(10x-20)-(5x+25)=15
We move all terms to the left:
(10x-20)-(5x+25)-(15)=0
We get rid of parentheses
10x-5x-20-25-15=0
We add all the numbers together, and all the variables
5x-60=0
We move all terms containing x to the left, all other terms to the right
5x=60
x=60/5
x=12
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