9=72/y

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Solution for 9=72/y equation: 


D( y )

y = 0

y = 0

y = 0

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

9 = 72/y // - 72/y

9-(72/y) = 0

9-72*y^-1 = 0

-72*y^-1 = -9 // : -72

y^-1 = 1/8

-1 < 0

1/(y^1) = 1/8 // * y^1

1 = 1/8*y^1 // : 1/8

8 = y^1

y = 8

y = 8

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