r/-2=10

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Solution for r/-2=10 equation: 


r in (-oo:+oo)

r/(-2) = 10 // - 10

r/(-2)-10 = 0

-1/2*r-10 = 0 // + 10

-1/2*r = 10 // : -1/2

r = 10/(-1/2)

r = -20

r = -20

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