r/9=-4

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Solution for r/9=-4 equation: 


r in (-oo:+oo)

r/9 = -4 // + 4

r/9+4 = 0

1/9*r+4 = 0 // - 4

1/9*r = -4 // : 1/9

r = -4/1/9

r = -36

r = -36

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