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p in (-oo:+oo)
(2*p)/4-(14/4) = -4 // + 4
(2*p)/4-(14/4)+4 = 0
(2*p)/4-7/2+4 = 0
1/2*p+1/2 = 0 // - 1/2
1/2*p = -1/2 // : 1/2
p = -1/2/1/2
p = -1
p = -1
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