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X-(0.10X)=100
We move all terms to the left:
X-(0.10X)-(100)=0
We add all the numbers together, and all the variables
X-(+0.10X)-100=0
We get rid of parentheses
X-0.10X-100=0
We add all the numbers together, and all the variables
0.9X-100=0
We move all terms containing X to the left, all other terms to the right
0.9X=100
X=100/0.9
X=111+0.099999999999994/0.9
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