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(2x+1)+(5x-42)=90
We move all terms to the left:
(2x+1)+(5x-42)-(90)=0
We get rid of parentheses
2x+5x+1-42-90=0
We add all the numbers together, and all the variables
7x-131=0
We move all terms containing x to the left, all other terms to the right
7x=131
x=131/7
x=18+5/7
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