-4=20/r-5

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Solution for -4=20/r-5 equation: 


D( r )

r = 0

r = 0

r = 0

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

-4 = 20/r-5 // - 20/r-5

5-(20/r)-4 = 0

5-20*r^-1-4 = 0

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

r^-1 = 1/20

-1 < 0

1/(r^1) = 1/20 // * r^1

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

20 = r^1

r = 20

r = 20

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