20/r=4

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Solution for 20/r=4 equation: 


D( r )

r = 0

r = 0

r = 0

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

20/r = 4 // - 4

20/r-4 = 0

20*r^-1 = 4 // : 20

r^-1 = 1/5

-1 < 0

1/(r^1) = 1/5 // * r^1

1 = 1/5*r^1 // : 1/5

5 = r^1

r = 5

r = 5

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