7200/y=90

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Solution for 7200/y=90 equation: 


D( y )

y = 0

y = 0

y = 0

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

7200/y = 90 // - 90

7200/y-90 = 0

7200*y^-1 = 90 // : 7200

y^-1 = 1/80

-1 < 0

1/(y^1) = 1/80 // * y^1

1 = 1/80*y^1 // : 1/80

80 = y^1

y = 80

y = 80

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