21=2c+13

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Solution for 21=2c+13 equation: 



21=2c+13

We move all terms to the left:

21-(2c+13)=0

We get rid of parentheses

-2c-13+21=0

We add all the numbers together, and all the variables

-2c+8=0

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

-2c=-8

c=-8/-2

c=+4

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