9=477/r+15

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Solution for 9=477/r+15 equation: 


D( r )

r = 0

r = 0

r = 0

r in (-oo:0) U (0:+oo)

9 = 477/r+15 // - 477/r+15

9-(477/r)-15 = 0

9-477*r^-1-15 = 0

-477*r^-1 = 6 // : -477

r^-1 = -2/159

-1 < 0

1/(r^1) = -2/159 // * r^1

1 = -2/159*r^1 // : -2/159

-159/2 = r^1

r = -159/2

r = -159/2

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