-4=-12/r

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Solution for -4=-12/r equation: 


D( r )

r = 0

r = 0

r = 0

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

-4 = -12/r // + -12/r

-(-12/r)-4 = 0

12*r^-1-4 = 0

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

r^-1 = 1/3

-1 < 0

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

1 = 1/3*r^1 // : 1/3

3 = r^1

r = 3

r = 3

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