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21.000=0.2x
We move all terms to the left:
21.000-(0.2x)=0
We add all the numbers together, and all the variables
-(+0.2x)+21.000=0
We add all the numbers together, and all the variables
-(+0.2x)+21=0
We get rid of parentheses
-0.2x+21=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-21
x=-21/-0.2
x=+105
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