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(8x)+(10x+9)=90
We move all terms to the left:
(8x)+(10x+9)-(90)=0
We get rid of parentheses
8x+10x+9-90=0
We add all the numbers together, and all the variables
18x-81=0
We move all terms containing x to the left, all other terms to the right
18x=81
x=81/18
x=4+1/2
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