-20=-5+r

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Solution for -20=-5+r equation: 



-20=-5+r

We move all terms to the left:

-20-(-5+r)=0

We add all the numbers together, and all the variables

-(r-5)-20=0

We get rid of parentheses

-r+5-20=0

We add all the numbers together, and all the variables

-1r-15=0

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

-r=15

r=15/-1

r=-15

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