15-40/p

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Solution for 15-40/p equation: 


D( p )

p = 0

p = 0

p = 0

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

15-(40/p) = 0

15-40*p^-1 = 0

-40*p^-1 = -15 // : -40

p^-1 = 3/8

-1 < 0

1/(p^1) = 3/8 // * p^1

1 = 3/8*p^1 // : 3/8

8/3 = p^1

p = 8/3

p = 8/3

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