15=21-3c

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Solution for 15=21-3c equation: 



15=21-3c

We move all terms to the left:

15-(21-3c)=0

We add all the numbers together, and all the variables

-(-3c+21)+15=0

We get rid of parentheses

3c-21+15=0

We add all the numbers together, and all the variables

3c-6=0

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

3c=6

c=6/3

c=2

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