7=c-20

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Solution for 7=c-20 equation: 



7=c-20

We move all terms to the left:

7-(c-20)=0

We get rid of parentheses

-c+20+7=0

We add all the numbers together, and all the variables

-1c+27=0

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

-c=-27

c=-27/-1

c=+27

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