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(2x-5)+x+(2x-20)=90
We move all terms to the left:
(2x-5)+x+(2x-20)-(90)=0
We add all the numbers together, and all the variables
x+(2x-5)+(2x-20)-90=0
We get rid of parentheses
x+2x+2x-5-20-90=0
We add all the numbers together, and all the variables
5x-115=0
We move all terms containing x to the left, all other terms to the right
5x=115
x=115/5
x=23
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