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(13x-25)+(3x+35)=90
We move all terms to the left:
(13x-25)+(3x+35)-(90)=0
We get rid of parentheses
13x+3x-25+35-90=0
We add all the numbers together, and all the variables
16x-80=0
We move all terms containing x to the left, all other terms to the right
16x=80
x=80/16
x=5
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