21=0.75x

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Solution for 21=0.75x equation: 



21=0.75x

We move all terms to the left:

21-(0.75x)=0

We add all the numbers together, and all the variables

-(+0.75x)+21=0

We get rid of parentheses

-0.75x+21=0

We move all terms containing x to the left, all other terms to the right

-0.75x=-21

x=-21/-0.75

x=+28

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