7c-84=-21

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Solution for 7c-84=-21 equation: 



7c-84=-21

We move all terms to the left:

7c-84-(-21)=0

We add all the numbers together, and all the variables

7c-63=0

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

7c=63

c=63/7

c=9

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