12=r/-7

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Solution for 12=r/-7 equation: 


r in (-oo:+oo)

12 = r/(-7) // - r/(-7)

12-(r/(-7)) = 0

1/7*r+12 = 0 // - 12

1/7*r = -12 // : 1/7

r = -12/1/7

r = -84

r = -84

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