-20=r-99

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Solution for -20=r-99 equation: 



-20=r-99

We move all terms to the left:

-20-(r-99)=0

We get rid of parentheses

-r+99-20=0

We add all the numbers together, and all the variables

-1r+79=0

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

-r=-79

r=-79/-1

r=+79

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