6c+21=4c+39

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Solution for 6c+21=4c+39 equation: 



6c+21=4c+39

We move all terms to the left:

6c+21-(4c+39)=0

We get rid of parentheses

6c-4c-39+21=0

We add all the numbers together, and all the variables

2c-18=0

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

2c=18

c=18/2

c=9

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