r/-2=4

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Solution for r/-2=4 equation: 


r in (-oo:+oo)

r/(-2) = 4 // - 4

r/(-2)-4 = 0

-1/2*r-4 = 0 // + 4

-1/2*r = 4 // : -1/2

r = 4/(-1/2)

r = -8

r = -8

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