r/-4=2

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Solution for r/-4=2 equation: 


r in (-oo:+oo)

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

r/(-4)-2 = 0

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

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

r = 2/(-1/4)

r = -8

r = -8

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