-9c=-81

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Solution for -9c=-81 equation: 



-9c=-81

We move all terms to the left:

-9c-(-81)=0

We add all the numbers together, and all the variables

-9c+81=0

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

-9c=-81

c=-81/-9

c=+9

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