90/y=27/12

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Solution for 90/y=27/12 equation: 


D( y )

y = 0

y = 0

y = 0

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

90/y = 27/12 // - 27/12

90/y-(27/12) = 0

90/y-9/4 = 0

90*y^-1 = 9/4 // : 90

y^-1 = 1/40

-1 < 0

1/(y^1) = 1/40 // * y^1

1 = 1/40*y^1 // : 1/40

40 = y^1

y = 40

y = 40

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