5=20/r

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Solution for 5=20/r equation: 


D( r )

r = 0

r = 0

r = 0

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

5 = 20/r // - 20/r

5-(20/r) = 0

5-20*r^-1 = 0

-20*r^-1 = -5 // : -20

r^-1 = 1/4

-1 < 0

1/(r^1) = 1/4 // * r^1

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

4 = r^1

r = 4

r = 4

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