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(x+14)+(4x-9)=90
We move all terms to the left:
(x+14)+(4x-9)-(90)=0
We get rid of parentheses
x+4x+14-9-90=0
We add all the numbers together, and all the variables
5x-85=0
We move all terms containing x to the left, all other terms to the right
5x=85
x=85/5
x=17
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