r/-3=12

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Solution for r/-3=12 equation: 


r in (-oo:+oo)

r/(-3) = 12 // - 12

r/(-3)-12 = 0

-1/3*r-12 = 0 // + 12

-1/3*r = 12 // : -1/3

r = 12/(-1/3)

r = -36

r = -36

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