-20r=-300

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Solution for -20r=-300 equation: 



-20r=-300

We move all terms to the left:

-20r-(-300)=0

We add all the numbers together, and all the variables

-20r+300=0

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

-20r=-300

r=-300/-20

r=+15

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