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p in (-oo:+oo)
p/5.6 = 9/2.8 // - 9/2.8
p/5.6-(9/2.8) = 0
p/5.6-3.21428571 = 0
0.17857143*p-3.21428571 = 0 // + 3.21428571
0.17857143*p = 3.21428571 // : 0.17857143
p = 3.21428571/0.17857143
p = 17.99999983
p = 17.99999983
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