-4=-4/r+8

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Solution for -4=-4/r+8 equation: 


D( r )

r = 0

r = 0

r = 0

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

-4 = 8-4/r // - 8-4/r

-(-4/r)-8-4 = 0

4*r^-1-8-4 = 0

4*r^-1 = 12 // : 4

r^-1 = 3

-1 < 0

1/(r^1) = 3 // * r^1

1 = 3*r^1 // : 3

1/3 = r^1

r = 1/3

r = 1/3

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