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