(4/6)=(8/r)

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Solution for (4/6)=(8/r) equation: 


D( r )

r = 0

r = 0

r = 0

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

4/6 = 8/r // - 8/r

4/6-(8/r) = 0

4/6-8*r^-1 = 0

-8*r^-1 = -2/3 // : -8

r^-1 = 1/12

-1 < 0

1/(r^1) = 1/12 // * r^1

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

12 = r^1

r = 12

r = 12

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