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(5x-3)+(x+9)=90
We move all terms to the left:
(5x-3)+(x+9)-(90)=0
We get rid of parentheses
5x+x-3+9-90=0
We add all the numbers together, and all the variables
6x-84=0
We move all terms containing x to the left, all other terms to the right
6x=84
x=84/6
x=14
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