21-3c=12

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Solution for 21-3c=12 equation: 



21-3c=12

We move all terms to the left:

21-3c-(12)=0

We add all the numbers together, and all the variables

-3c+9=0

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

-3c=-9

c=-9/-3

c=+3

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