12=c+9

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Solution for 12=c+9 equation: 



12=c+9

We move all terms to the left:

12-(c+9)=0

We get rid of parentheses

-c-9+12=0

We add all the numbers together, and all the variables

-1c+3=0

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

-c=-3

c=-3/-1

c=+3

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