21=1+2c

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Solution for 21=1+2c equation: 



21=1+2c

We move all terms to the left:

21-(1+2c)=0

We add all the numbers together, and all the variables

-(2c+1)+21=0

We get rid of parentheses

-2c-1+21=0

We add all the numbers together, and all the variables

-2c+20=0

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

-2c=-20

c=-20/-2

c=+10

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