20=3c-7

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Solution for 20=3c-7 equation: 



20=3c-7

We move all terms to the left:

20-(3c-7)=0

We get rid of parentheses

-3c+7+20=0

We add all the numbers together, and all the variables

-3c+27=0

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

-3c=-27

c=-27/-3

c=+9

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