4/r/-2=18

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Solution for 4/r/-2=18 equation: 


D( r )

r = 0

r = 0

r = 0

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

(4/r)/(-2) = 18 // - 18

(4/r)/(-2)-18 = 0

-2*r^-1 = 18 // : -2

r^-1 = -9

-1 < 0

1/(r^1) = -9 // * r^1

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

-1/9 = r^1

r = -1/9

r = -1/9

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