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(13x+3)+(15x-19)=90
We move all terms to the left:
(13x+3)+(15x-19)-(90)=0
We get rid of parentheses
13x+15x+3-19-90=0
We add all the numbers together, and all the variables
28x-106=0
We move all terms containing x to the left, all other terms to the right
28x=106
x=106/28
x=3+11/14
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