2c+21=3c

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Solution for 2c+21=3c equation: 



2c+21=3c

We move all terms to the left:

2c+21-(3c)=0

We add all the numbers together, and all the variables

-1c+21=0

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

-c=-21

c=-21/-1

c=+21

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