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(x-0.1x)-0.2(x-0.1x)=0
We add all the numbers together, and all the variables
(+0.9x)-0.2(+0.9x)=0
We multiply parentheses
(+0.9x)-0x=0
We get rid of parentheses
0.9x-0x=0
We add all the numbers together, and all the variables
-0.1x=0
x=0/-0.1
x=0
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