9/y-4

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Solution for 9/y-4 equation: 


D( y )

y = 0

y = 0

y = 0

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

9/y-4 = 0

9*y^-1 = 4 // : 9

y^-1 = 4/9

-1 < 0

1/(y^1) = 4/9 // * y^1

1 = 4/9*y^1 // : 4/9

9/4 = y^1

y = 9/4

y = 9/4

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