2=12/r

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Solution for 2=12/r equation: 


D( r )

r = 0

r = 0

r = 0

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

2 = 12/r // - 12/r

2-(12/r) = 0

2-12*r^-1 = 0

-12*r^-1 = -2 // : -12

r^-1 = 1/6

-1 < 0

1/(r^1) = 1/6 // * r^1

1 = 1/6*r^1 // : 1/6

6 = r^1

r = 6

r = 6

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