6c+21=4c+57

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Solution for 6c+21=4c+57 equation: 



6c+21=4c+57

We move all terms to the left:

6c+21-(4c+57)=0

We get rid of parentheses

6c-4c-57+21=0

We add all the numbers together, and all the variables

2c-36=0

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

2c=36

c=36/2

c=18

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