13/r=65/15

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Solution for 13/r=65/15 equation: 


D( r )

r = 0

r = 0

r = 0

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

13/r = 65/15 // - 65/15

13/r-(65/15) = 0

13/r-13/3 = 0

13*r^-1 = 13/3 // : 13

r^-1 = 1/3

-1 < 0

1/(r^1) = 1/3 // * r^1

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

3 = r^1

r = 3

r = 3

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