-5c-2c=21

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Solution for -5c-2c=21 equation: 



-5c-2c=21

We move all terms to the left:

-5c-2c-(21)=0

We add all the numbers together, and all the variables

-7c-21=0

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

-7c=21

c=21/-7

c=-3

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