21/56=3/d

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Solution for 21/56=3/d equation: 


D( d )

d = 0

d = 0

d = 0

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

21/56 = 3/d // - 3/d

21/56-(3/d) = 0

21/56-3*d^-1 = 0

-3*d^-1 = -3/8 // : -3

d^-1 = 1/8

-1 < 0

1/(d^1) = 1/8 // * d^1

1 = 1/8*d^1 // : 1/8

8 = d^1

d = 8

d = 8

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