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(x+8)-(8x+1)=90
We move all terms to the left:
(x+8)-(8x+1)-(90)=0
We get rid of parentheses
x-8x+8-1-90=0
We add all the numbers together, and all the variables
-7x-83=0
We move all terms containing x to the left, all other terms to the right
-7x=83
x=83/-7
x=-11+6/7
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