-21=5c+9

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Solution for -21=5c+9 equation: 



-21=5c+9

We move all terms to the left:

-21-(5c+9)=0

We get rid of parentheses

-5c-9-21=0

We add all the numbers together, and all the variables

-5c-30=0

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

-5c=30

c=30/-5

c=-6

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