21=0.7x-0.4x

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Solution for 21=0.7x-0.4x equation: 



21=0.7x-0.4x

We move all terms to the left:

21-(0.7x-0.4x)=0

We add all the numbers together, and all the variables

-(+0.3x)+21=0

We get rid of parentheses

-0.3x+21=0

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

-0.3x=-21

x=-21/-0.3

x=+70

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