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(2x+15)+49=90
We move all terms to the left:
(2x+15)+49-(90)=0
We add all the numbers together, and all the variables
(2x+15)-41=0
We get rid of parentheses
2x+15-41=0
We add all the numbers together, and all the variables
2x-26=0
We move all terms containing x to the left, all other terms to the right
2x=26
x=26/2
x=13
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