3c+21=99

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Solution for 3c+21=99 equation: 



3c+21=99

We move all terms to the left:

3c+21-(99)=0

We add all the numbers together, and all the variables

3c-78=0

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

3c=78

c=78/3

c=26

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