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p in (-oo:+oo)
p = 8.78*(56/1000) // - 8.78*(56/1000)
p-(8.78*(56/1000)) = 0
p-0.49168 = 0
p-0.49168 = 0 // + 0.49168
p = 0.49168
p = 0.49168
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