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p in (-oo:+oo)
4*p = 1/40 // - 1/40
4*p-(1/40) = 0
4*p-1/40 = 0
4*p-1/40 = 0 // + 1/40
4*p = 1/40 // : 4
p = 1/40/4
p = 1/160
p = 1/160
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