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(4x-5)+(2x+1)=90
We move all terms to the left:
(4x-5)+(2x+1)-(90)=0
We get rid of parentheses
4x+2x-5+1-90=0
We add all the numbers together, and all the variables
6x-94=0
We move all terms containing x to the left, all other terms to the right
6x=94
x=94/6
x=15+2/3
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