21=3-c

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Solution for 21=3-c equation: 



21=3-c

We move all terms to the left:

21-(3-c)=0

We add all the numbers together, and all the variables

-(-1c+3)+21=0

We get rid of parentheses

1c-3+21=0

We add all the numbers together, and all the variables

c+18=0

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

c=-18

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