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D( p )
3*p+9 = 0
3*p+9 = 0
3*p+9 = 0
3*p+9 = 0 // - 9
3*p = -9 // : 3
p = -9/3
p = -3
p in (-oo:-3) U (-3:+oo)
(5*p+5)/(3*p+9) = 7 // - 7
(5*p+5)/(3*p+9)-7 = 0
(5*p+5)/(3*p+9)+(-7*(3*p+9))/(3*p+9) = 0
5*p-7*(3*p+9)+5 = 0
-16*p-58 = 0
(-16*p-58)/(3*p+9) = 0
(-16*p-58)/(3*p+9) = 0 // * 3*p+9
-16*p-58 = 0
-16*p-58 = 0 // + 58
-16*p = 58 // : -16
p = 58/(-16)
p = -29/8
p = -29/8
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