15/r=3

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Solution for 15/r=3 equation: 


D( r )

r = 0

r = 0

r = 0

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

15/r = 3 // - 3

15/r-3 = 0

15*r^-1 = 3 // : 15

r^-1 = 1/5

-1 < 0

1/(r^1) = 1/5 // * r^1

1 = 1/5*r^1 // : 1/5

5 = r^1

r = 5

r = 5

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