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(4x+15)+(3x+13)=90
We move all terms to the left:
(4x+15)+(3x+13)-(90)=0
We get rid of parentheses
4x+3x+15+13-90=0
We add all the numbers together, and all the variables
7x-62=0
We move all terms containing x to the left, all other terms to the right
7x=62
x=62/7
x=8+6/7
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