30=22.5/r

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Solution for 30=22.5/r equation: 


D( r )

r = 0

r = 0

r = 0

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

30 = 22.5/r // - 22.5/r

30-(22.5/r) = 0

30-22.5*r^-1 = 0

-22.5*r^-1 = -30 // : -22.5

r^-1 = 1.33333333

-1 < 0

1/(r^1) = 1.33333333 // * r^1

1 = 1.33333333*r^1 // : 1.33333333

0.75 = r^1

r = 0.75

r = 0.75

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