-21=-7-4c

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Solution for -21=-7-4c equation: 



-21=-7-4c

We move all terms to the left:

-21-(-7-4c)=0

We add all the numbers together, and all the variables

-(-4c-7)-21=0

We get rid of parentheses

4c+7-21=0

We add all the numbers together, and all the variables

4c-14=0

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

4c=14

c=14/4

c=3+1/2

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