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X=0.9X+90
We move all terms to the left:
X-(0.9X+90)=0
We get rid of parentheses
X-0.9X-90=0
We add all the numbers together, and all the variables
0.1X-90=0
We move all terms containing X to the left, all other terms to the right
0.1X=90
X=90/0.1
X=900
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