20=7+c

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Solution for 20=7+c equation: 



20=7+c

We move all terms to the left:

20-(7+c)=0

We add all the numbers together, and all the variables

-(c+7)+20=0

We get rid of parentheses

-c-7+20=0

We add all the numbers together, and all the variables

-1c+13=0

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

-c=-13

c=-13/-1

c=+13

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