40-y/y=8/y

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Solution for 40-y/y=8/y equation: 


D( y )

y = 0

y = 0

y = 0

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

40-(y/y) = 8/y // - 8/y

40-(8/y)-(y/y) = 0

40-8*y^-1-1 = 0

-8*y^-1 = -39 // : -8

y^-1 = 39/8

-1 < 0

1/(y^1) = 39/8 // * y^1

1 = 39/8*y^1 // : 39/8

8/39 = y^1

y = 8/39

y = 8/39

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