12/25=18/r

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Solution for 12/25=18/r equation: 


D( r )

r = 0

r = 0

r = 0

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

12/25 = 18/r // - 18/r

12/25-(18/r) = 0

12/25-18*r^-1 = 0

-18*r^-1 = -12/25 // : -18

r^-1 = 2/75

-1 < 0

1/(r^1) = 2/75 // * r^1

1 = 2/75*r^1 // : 2/75

75/2 = r^1

r = 75/2

r = 75/2

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