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(3x+15)+(10x+10)=90
We move all terms to the left:
(3x+15)+(10x+10)-(90)=0
We get rid of parentheses
3x+10x+15+10-90=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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