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D( p )
p+7 = 0
p+4 = 0
p+7 = 0
p+7 = 0
p+7 = 0 // - 7
p = -7
p+4 = 0
p+4 = 0
p+4 = 0 // - 4
p = -4
p in (-oo:-7) U (-7:-4) U (-4:+oo)
(((p-2)/(p+4))*(p+7))/(p+7) = 0
(p-2)/(p+4) = 0
p-2 = 0 // + 2
p = 2
p = 2
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