3/d-4/7

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Solution for 3/d-4/7 equation: 


D( d )

d = 0

d = 0

d = 0

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

3/d-(4/7) = 0

3/d-4/7 = 0

3*d^-1 = 4/7 // : 3

d^-1 = 4/21

-1 < 0

1/(d^1) = 4/21 // * d^1

1 = 4/21*d^1 // : 4/21

21/4 = d^1

d = 21/4

d = 21/4

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