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(5x+10)+(8x+15)=90
We move all terms to the left:
(5x+10)+(8x+15)-(90)=0
We get rid of parentheses
5x+8x+10+15-90=0
We add all the numbers together, and all the variables
13x-65=0
We move all terms containing x to the left, all other terms to the right
13x=65
x=65/13
x=5
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