6c-4+7=21

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Solution for 6c-4+7=21 equation: 



6c-4+7=21

We move all terms to the left:

6c-4+7-(21)=0

We add all the numbers together, and all the variables

6c-18=0

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

6c=18

c=18/6

c=3

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