12/21=5/p

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Solution for 12/21=5/p equation: 


D( p )

p = 0

p = 0

p = 0

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

12/21 = 5/p // - 5/p

12/21-(5/p) = 0

12/21-5*p^-1 = 0

-5*p^-1 = -4/7 // : -5

p^-1 = 4/35

-1 < 0

1/(p^1) = 4/35 // * p^1

1 = 4/35*p^1 // : 4/35

35/4 = p^1

p = 35/4

p = 35/4

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