4/r=2/9

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Solution for 4/r=2/9 equation: 


D( r )

r = 0

r = 0

r = 0

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

4/r = 2/9 // - 2/9

4/r-(2/9) = 0

4/r-2/9 = 0

4*r^-1 = 2/9 // : 4

r^-1 = 1/18

-1 < 0

1/(r^1) = 1/18 // * r^1

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

18 = r^1

r = 18

r = 18

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