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(7x-1)+(4x+8)=90
We move all terms to the left:
(7x-1)+(4x+8)-(90)=0
We get rid of parentheses
7x+4x-1+8-90=0
We add all the numbers together, and all the variables
11x-83=0
We move all terms containing x to the left, all other terms to the right
11x=83
x=83/11
x=7+6/11
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