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(9x+9)/8=-90
We move all terms to the left:
(9x+9)/8-(-90)=0
We add all the numbers together, and all the variables
(9x+9)/8+90=0
We multiply all the terms by the denominator
(9x+9)+90*8=0
We add all the numbers together, and all the variables
(9x+9)+720=0
We get rid of parentheses
9x+9+720=0
We add all the numbers together, and all the variables
9x+729=0
We move all terms containing x to the left, all other terms to the right
9x=-729
x=-729/9
x=-81
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