-15=12+9c

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Solution for -15=12+9c equation: 



-15=12+9c

We move all terms to the left:

-15-(12+9c)=0

We add all the numbers together, and all the variables

-(9c+12)-15=0

We get rid of parentheses

-9c-12-15=0

We add all the numbers together, and all the variables

-9c-27=0

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

-9c=27

c=27/-9

c=-3

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