2/5=4/v

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Solution for 2/5=4/v equation: 


D( v )

v = 0

v = 0

v = 0

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

2/5 = 4/v // - 4/v

2/5-(4/v) = 0

2/5-4*v^-1 = 0

-4*v^-1 = -2/5 // : -4

v^-1 = 1/10

-1 < 0

1/(v^1) = 1/10 // * v^1

1 = 1/10*v^1 // : 1/10

10 = v^1

v = 10

v = 10

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