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p in (-oo:+oo)
(p/1)/2 = 50 // - 50
(p/1)/2-50 = 0
p/2-50 = 0
1/2*p-50 = 0 // + 50
1/2*p = 50 // : 1/2
p = 50/1/2
p = 100
p = 100
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