4/9=6/r

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Solution for 4/9=6/r equation: 


D( r )

r = 0

r = 0

r = 0

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

4/9 = 6/r // - 6/r

4/9-(6/r) = 0

4/9-6*r^-1 = 0

-6*r^-1 = -4/9 // : -6

r^-1 = 2/27

-1 < 0

1/(r^1) = 2/27 // * r^1

1 = 2/27*r^1 // : 2/27

27/2 = r^1

r = 27/2

r = 27/2

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