6=-9/y

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Solution for 6=-9/y equation: 


D( y )

y = 0

y = 0

y = 0

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

6 = -9/y // + -9/y

6-(-9/y) = 0

9*y^-1+6 = 0

9*y^-1 = -6 // : 9

y^-1 = -2/3

-1 < 0

1/(y^1) = -2/3 // * y^1

1 = -2/3*y^1 // : -2/3

-3/2 = y^1

y = -3/2

y = -3/2

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