3/5=21/d

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Solution for 3/5=21/d equation: 


D( d )

d = 0

d = 0

d = 0

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

3/5 = 21/d // - 21/d

3/5-(21/d) = 0

3/5-21*d^-1 = 0

-21*d^-1 = -3/5 // : -21

d^-1 = 1/35

-1 < 0

1/(d^1) = 1/35 // * d^1

1 = 1/35*d^1 // : 1/35

35 = d^1

d = 35

d = 35

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