9=21+c

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Solution for 9=21+c equation: 



9=21+c

We move all terms to the left:

9-(21+c)=0

We add all the numbers together, and all the variables

-(c+21)+9=0

We get rid of parentheses

-c-21+9=0

We add all the numbers together, and all the variables

-1c-12=0

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

-c=12

c=12/-1

c=-12

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