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(2x+1)+(x+5)=90
We move all terms to the left:
(2x+1)+(x+5)-(90)=0
We get rid of parentheses
2x+x+1+5-90=0
We add all the numbers together, and all the variables
3x-84=0
We move all terms containing x to the left, all other terms to the right
3x=84
x=84/3
x=28
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