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(13x-23)+(5x+5)=90
We move all terms to the left:
(13x-23)+(5x+5)-(90)=0
We get rid of parentheses
13x+5x-23+5-90=0
We add all the numbers together, and all the variables
18x-108=0
We move all terms containing x to the left, all other terms to the right
18x=108
x=108/18
x=6
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