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(13x-8)+(x)=90
We move all terms to the left:
(13x-8)+(x)-(90)=0
We add all the numbers together, and all the variables
x+(13x-8)-90=0
We get rid of parentheses
x+13x-8-90=0
We add all the numbers together, and all the variables
14x-98=0
We move all terms containing x to the left, all other terms to the right
14x=98
x=98/14
x=7
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