-12+3c=21

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Solution for -12+3c=21 equation: 



-12+3c=21

We move all terms to the left:

-12+3c-(21)=0

We add all the numbers together, and all the variables

3c-33=0

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

3c=33

c=33/3

c=11

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