13/11=9/y

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Solution for 13/11=9/y equation: 


D( y )

y = 0

y = 0

y = 0

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

13/11 = 9/y // - 9/y

13/11-(9/y) = 0

13/11-9*y^-1 = 0

-9*y^-1 = -13/11 // : -9

y^-1 = 13/99

-1 < 0

1/(y^1) = 13/99 // * y^1

1 = 13/99*y^1 // : 13/99

99/13 = y^1

y = 99/13

y = 99/13

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