-20=-4+r

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Solution for -20=-4+r equation: 



-20=-4+r

We move all terms to the left:

-20-(-4+r)=0

We add all the numbers together, and all the variables

-(r-4)-20=0

We get rid of parentheses

-r+4-20=0

We add all the numbers together, and all the variables

-1r-16=0

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

-r=16

r=16/-1

r=-16

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