-4=-2/v

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Solution for -4=-2/v equation: 


D( v )

v = 0

v = 0

v = 0

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

-4 = -2/v // + -2/v

-(-2/v)-4 = 0

2*v^-1-4 = 0

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

v^-1 = 2

-1 < 0

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

1 = 2*v^1 // : 2

1/2 = v^1

v = 1/2

v = 1/2

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