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(5x+8)=90
We move all terms to the left:
(5x+8)-(90)=0
We get rid of parentheses
5x+8-90=0
We add all the numbers together, and all the variables
5x-82=0
We move all terms containing x to the left, all other terms to the right
5x=82
x=82/5
x=16+2/5
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