9=21-c9

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Solution for 9=21-c9 equation: 



9=21-c9

We move all terms to the left:

9-(21-c9)=0

We add all the numbers together, and all the variables

-(-1c^9+21)+9=0

We get rid of parentheses

1c^9-21+9=0

We do not support ecpression: c^9

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