-4/y=8

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Solution for -4/y=8 equation: 


D( y )

y = 0

y = 0

y = 0

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

-4/y = 8 // - 8

-4/y-8 = 0

-4*y^-1 = 8 // : -4

y^-1 = -2

-1 < 0

1/(y^1) = -2 // * y^1

1 = -2*y^1 // : -2

-1/2 = y^1

y = -1/2

y = -1/2

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