21=4c-7

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Solution for 21=4c-7 equation: 



21=4c-7

We move all terms to the left:

21-(4c-7)=0

We get rid of parentheses

-4c+7+21=0

We add all the numbers together, and all the variables

-4c+28=0

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

-4c=-28

c=-28/-4

c=+7

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