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(13x-19)+(6x+14)=90
We move all terms to the left:
(13x-19)+(6x+14)-(90)=0
We get rid of parentheses
13x+6x-19+14-90=0
We add all the numbers together, and all the variables
19x-95=0
We move all terms containing x to the left, all other terms to the right
19x=95
x=95/19
x=5
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