r/3=-4

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Solution for r/3=-4 equation: 


r in (-oo:+oo)

r/3 = -4 // + 4

r/3+4 = 0

1/3*r+4 = 0 // - 4

1/3*r = -4 // : 1/3

r = -4/1/3

r = -12

r = -12

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