21=0.7c

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Solution for 21=0.7c equation: 



21=0.7c

We move all terms to the left:

21-(0.7c)=0

We add all the numbers together, and all the variables

-(+0.7c)+21=0

We get rid of parentheses

-0.7c+21=0

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

-0.7c=-21

c=-21/-0.7

c=+30

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