(0.1/2)=(0.5/r)

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Solution for (0.1/2)=(0.5/r) equation: 


D( r )

r = 0

r = 0

r = 0

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

0.1/2 = 0.5/r // - 0.5/r

0.1/2-(0.5/r) = 0

0.1/2-0.5*r^-1 = 0

-0.5*r^-1 = -0.05 // : -0.5

r^-1 = 0.1

-1 < 0

1/(r^1) = 0.1 // * r^1

1 = 0.1*r^1 // : 0.1

10 = r^1

r = 10

r = 10

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