21=30c+6

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Solution for 21=30c+6 equation: 



21=30c+6

We move all terms to the left:

21-(30c+6)=0

We get rid of parentheses

-30c-6+21=0

We add all the numbers together, and all the variables

-30c+15=0

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

-30c=-15

c=-15/-30

c=1/2

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