9=21-4c

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Solution for 9=21-4c equation: 



9=21-4c

We move all terms to the left:

9-(21-4c)=0

We add all the numbers together, and all the variables

-(-4c+21)+9=0

We get rid of parentheses

4c-21+9=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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