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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