2/7=4/d

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Solution for 2/7=4/d equation: 


D( d )

d = 0

d = 0

d = 0

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

2/7 = 4/d // - 4/d

2/7-(4/d) = 0

2/7-4*d^-1 = 0

-4*d^-1 = -2/7 // : -4

d^-1 = 1/14

-1 < 0

1/(d^1) = 1/14 // * d^1

1 = 1/14*d^1 // : 1/14

14 = d^1

d = 14

d = 14

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