30/42=55/d

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Solution for 30/42=55/d equation: 


D( d )

d = 0

d = 0

d = 0

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

30/42 = 55/d // - 55/d

30/42-(55/d) = 0

30/42-55*d^-1 = 0

-55*d^-1 = -5/7 // : -55

d^-1 = 1/77

-1 < 0

1/(d^1) = 1/77 // * d^1

1 = 1/77*d^1 // : 1/77

77 = d^1

d = 77

d = 77

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