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(x+1)+(2x-7)=x+89
We move all terms to the left:
(x+1)+(2x-7)-(x+89)=0
We get rid of parentheses
x+2x-x+1-7-89=0
We add all the numbers together, and all the variables
2x-95=0
We move all terms containing x to the left, all other terms to the right
2x=95
x=95/2
x=47+1/2
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