-1=-2/y

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Solution for -1=-2/y equation: 


D( y )

y = 0

y = 0

y = 0

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

-1 = -2/y // + -2/y

-(-2/y)-1 = 0

2*y^-1-1 = 0

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

y^-1 = 1/2

-1 < 0

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

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

2 = y^1

y = 2

y = 2

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