13/r=-19/9

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Solution for 13/r=-19/9 equation: 


D( r )

r = 0

r = 0

r = 0

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

13/r = -19/9 // + -19/9

13/r-(-19/9) = 0

13/r+19/9 = 0

13*r^-1 = -19/9 // : 13

r^-1 = -19/117

-1 < 0

1/(r^1) = -19/117 // * r^1

1 = -19/117*r^1 // : -19/117

-117/19 = r^1

r = -117/19

r = -117/19

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