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(13x-19)=90
We move all terms to the left:
(13x-19)-(90)=0
We get rid of parentheses
13x-19-90=0
We add all the numbers together, and all the variables
13x-109=0
We move all terms containing x to the left, all other terms to the right
13x=109
x=109/13
x=8+5/13
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