2/3=5/r

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Solution for 2/3=5/r equation: 


D( r )

r = 0

r = 0

r = 0

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

2/3 = 5/r // - 5/r

2/3-(5/r) = 0

2/3-5*r^-1 = 0

-5*r^-1 = -2/3 // : -5

r^-1 = 2/15

-1 < 0

1/(r^1) = 2/15 // * r^1

1 = 2/15*r^1 // : 2/15

15/2 = r^1

r = 15/2

r = 15/2

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