r/-5=20

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Solution for r/-5=20 equation: 


r in (-oo:+oo)

r/(-5) = 20 // - 20

r/(-5)-20 = 0

-1/5*r-20 = 0 // + 20

-1/5*r = 20 // : -1/5

r = 20/(-1/5)

r = -100

r = -100

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