21=4c+9

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Solution for 21=4c+9 equation: 



21=4c+9

We move all terms to the left:

21-(4c+9)=0

We get rid of parentheses

-4c-9+21=0

We add all the numbers together, and all the variables

-4c+12=0

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

-4c=-12

c=-12/-4

c=+3

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