5/r=7/13

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Solution for 5/r=7/13 equation: 


D( r )

r = 0

r = 0

r = 0

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

5/r = 7/13 // - 7/13

5/r-(7/13) = 0

5/r-7/13 = 0

5*r^-1 = 7/13 // : 5

r^-1 = 7/65

-1 < 0

1/(r^1) = 7/65 // * r^1

1 = 7/65*r^1 // : 7/65

65/7 = r^1

r = 65/7

r = 65/7

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