45/5=81/p

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Solution for 45/5=81/p equation: 


D( p )

p = 0

p = 0

p = 0

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

45/5 = 81/p // - 81/p

45/5-(81/p) = 0

45/5-81*p^-1 = 0

-81*p^-1 = -9 // : -81

p^-1 = 1/9

-1 < 0

1/(p^1) = 1/9 // * p^1

1 = 1/9*p^1 // : 1/9

9 = p^1

p = 9

p = 9

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