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(2X+13)+(6X+5)=90
We move all terms to the left:
(2X+13)+(6X+5)-(90)=0
We get rid of parentheses
2X+6X+13+5-90=0
We add all the numbers together, and all the variables
8X-72=0
We move all terms containing X to the left, all other terms to the right
8X=72
X=72/8
X=9
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