21=5+4c

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Solution for 21=5+4c equation: 



21=5+4c

We move all terms to the left:

21-(5+4c)=0

We add all the numbers together, and all the variables

-(4c+5)+21=0

We get rid of parentheses

-4c-5+21=0

We add all the numbers together, and all the variables

-4c+16=0

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

-4c=-16

c=-16/-4

c=+4

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