3c-12=9

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Solution for 3c-12=9 equation: 



3c-12=9

We move all terms to the left:

3c-12-(9)=0

We add all the numbers together, and all the variables

3c-21=0

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

3c=21

c=21/3

c=7

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