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p in (-oo:+oo)
8 = -p/2 // + -p/2
8-(-p/2) = 0
(1/2)*p+8 = 0
1/2*p+8 = 0 // - 8
1/2*p = -8 // : 1/2
p = -8/1/2
p = -16
p = -16
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