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(x+20)+(17x-15)=15x+20
We move all terms to the left:
(x+20)+(17x-15)-(15x+20)=0
We get rid of parentheses
x+17x-15x+20-15-20=0
We add all the numbers together, and all the variables
3x-15=0
We move all terms containing x to the left, all other terms to the right
3x=15
x=15/3
x=5
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