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99=0.1x
We move all terms to the left:
99-(0.1x)=0
We add all the numbers together, and all the variables
-(+0.1x)+99=0
We get rid of parentheses
-0.1x+99=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-99
x=-99/-0.1
x=+990
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