21=16+c

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Solution for 21=16+c equation: 



21=16+c

We move all terms to the left:

21-(16+c)=0

We add all the numbers together, and all the variables

-(c+16)+21=0

We get rid of parentheses

-c-16+21=0

We add all the numbers together, and all the variables

-1c+5=0

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

-c=-5

c=-5/-1

c=+5

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