r/-1=21

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Solution for r/-1=21 equation: 


r in (-oo:+oo)

r/(-1) = 21 // - 21

r/(-1)-21 = 0

-r-21 = 0

-r-21 = 0 // + 21

-r = 21 // * -1

r = -21

r = -21

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