4=-2/u

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Solution for 4=-2/u equation: 


D( u )

u = 0

u = 0

u = 0

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

4 = -2/u // + -2/u

4-(-2/u) = 0

2*u^-1+4 = 0

2*u^-1 = -4 // : 2

u^-1 = -2

-1 < 0

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

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

-1/2 = u^1

u = -1/2

u = -1/2

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