21=2-c

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Solution for 21=2-c equation: 



21=2-c

We move all terms to the left:

21-(2-c)=0

We add all the numbers together, and all the variables

-(-1c+2)+21=0

We get rid of parentheses

1c-2+21=0

We add all the numbers together, and all the variables

c+19=0

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

c=-19

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