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(5x-14)+(8x)=90
We move all terms to the left:
(5x-14)+(8x)-(90)=0
We add all the numbers together, and all the variables
8x+(5x-14)-90=0
We get rid of parentheses
8x+5x-14-90=0
We add all the numbers together, and all the variables
13x-104=0
We move all terms containing x to the left, all other terms to the right
13x=104
x=104/13
x=8
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