c+21=2c-7

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Solution for c+21=2c-7 equation: 



c+21=2c-7

We move all terms to the left:

c+21-(2c-7)=0

We get rid of parentheses

c-2c+7+21=0

We add all the numbers together, and all the variables

-1c+28=0

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

-c=-28

c=-28/-1

c=+28

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