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111.11111111=x-0.1x
We move all terms to the left:
111.11111111-(x-0.1x)=0
We add all the numbers together, and all the variables
-(+0.9x)+111.11111111=0
We get rid of parentheses
-0.9x+111.11111111=0
We move all terms containing x to the left, all other terms to the right
-0.9x=-111.11111111
x=-111.11111111/-0.9
x=123+0.41111110999999/0.9
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