27=r/-4

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Solution for 27=r/-4 equation: 


r in (-oo:+oo)

27 = r/(-4) // - r/(-4)

27-(r/(-4)) = 0

1/4*r+27 = 0 // - 27

1/4*r = -27 // : 1/4

r = -27/1/4

r = -108

r = -108

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