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

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

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

r = -4/(-1/2)

r = 8

r = 8

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