21=1.28x-x

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Solution for 21=1.28x-x equation: 



21=1.28x-x

We move all terms to the left:

21-(1.28x-x)=0

We add all the numbers together, and all the variables

-(+0.28x)+21=0

We get rid of parentheses

-0.28x+21=0

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

-0.28x=-21

x=-21/-0.28

x=74+0.28/0.28

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