-2=9/y

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Solution for -2=9/y equation: 


D( y )

y = 0

y = 0

y = 0

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

-2 = 9/y // - 9/y

-(9/y)-2 = 0

-9*y^-1-2 = 0

-9*y^-1 = 2 // : -9

y^-1 = -2/9

-1 < 0

1/(y^1) = -2/9 // * y^1

1 = -2/9*y^1 // : -2/9

-9/2 = y^1

y = -9/2

y = -9/2

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