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(5x+19)+(3x+15)=90
We move all terms to the left:
(5x+19)+(3x+15)-(90)=0
We get rid of parentheses
5x+3x+19+15-90=0
We add all the numbers together, and all the variables
8x-56=0
We move all terms containing x to the left, all other terms to the right
8x=56
x=56/8
x=7
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