3/7=21/p

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Solution for 3/7=21/p equation: 


D( p )

p = 0

p = 0

p = 0

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

3/7 = 21/p // - 21/p

3/7-(21/p) = 0

3/7-21*p^-1 = 0

-21*p^-1 = -3/7 // : -21

p^-1 = 1/49

-1 < 0

1/(p^1) = 1/49 // * p^1

1 = 1/49*p^1 // : 1/49

49 = p^1

p = 49

p = 49

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