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(5x-15)+(3x+1)=90
We move all terms to the left:
(5x-15)+(3x+1)-(90)=0
We get rid of parentheses
5x+3x-15+1-90=0
We add all the numbers together, and all the variables
8x-104=0
We move all terms containing x to the left, all other terms to the right
8x=104
x=104/8
x=13
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