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D( p )
9*p-36 = 0
5*p^2 = 0
9*p-36 = 0
9*p-36 = 0
9*p-36 = 0 // + 36
9*p = 36 // : 9
p = 36/9
p = 4
5*p^2 = 0
5*p^2 = 0
5*p^2 = 0 // : 5
p^2 = 0
p = 0
p in (-oo:0) U (0:4) U (4:+oo)
((1/(5*p^2))*(5*p^3-(35*p^2)))/(9*p-36) = 0
((1/(5*p^2))*(5*p^3-35*p^2))/(9*p-36) = 0
(1/5*p^-2*(5*p^3-35*p^2))/(9*p-36) = 0
5*p^3-35*p^2 = 0
5*p^2*(p-7) = 0
p-7 = 0 // + 7
p = 7
5*p^2*(p-7) = 0
(1/5*5*p^-2*p^2*(p-7))/(9*p-36) = 0
( 1/5*p^-2 )
1/5*p^-2 = 0 // : 1/5
p^-2 = 0
p naleu017Cy do O
( 5*p^2 )
5*p^2 = 0 // : 5
p^2 = 0
p = 0
( p-7 )
p-7 = 0 // + 7
p = 7
p in { 0}
p = 7
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