21=2x+.6x+.8x

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Solution for 21=2x+.6x+.8x equation: 



21=2x+.6x+.8x

We move all terms to the left:

21-(2x+.6x+.8x)=0

We add all the numbers together, and all the variables

-(+3.4x)+21=0

We get rid of parentheses

-3.4x+21=0

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

-3.4x=-21

x=-21/-3.4

x=6+0.6/3.4

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