4/3=9/r

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Solution for 4/3=9/r equation: 


D( r )

r = 0

r = 0

r = 0

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

4/3 = 9/r // - 9/r

4/3-(9/r) = 0

4/3-9*r^-1 = 0

-9*r^-1 = -4/3 // : -9

r^-1 = 4/27

-1 < 0

1/(r^1) = 4/27 // * r^1

1 = 4/27*r^1 // : 4/27

27/4 = r^1

r = 27/4

r = 27/4

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