7c-3c=21

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Solution for 7c-3c=21 equation: 



7c-3c=21

We move all terms to the left:

7c-3c-(21)=0

We add all the numbers together, and all the variables

4c-21=0

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

4c=21

c=21/4

c=5+1/4

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