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X-(X*0.1)=9
We move all terms to the left:
X-(X*0.1)-(9)=0
We add all the numbers together, and all the variables
X-(+X*0.1)-9=0
We get rid of parentheses
X-X*0.1-9=0
Wy multiply elements
X-0.1X-9=0
We add all the numbers together, and all the variables
0.9X-9=0
We move all terms containing X to the left, all other terms to the right
0.9X=9
X=9/0.9
X=10
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