-10r-20=20=-20

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Solution for -10r-20=20=-20 equation: 



-10r-20=20=-20

We move all terms to the left:

-10r-20-(20)=0

We add all the numbers together, and all the variables

-10r-40=0

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

-10r=40

r=40/-10

r=-4

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