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p in (-oo:+oo)
3.8 = p/3-72 // - p/3-72
3.8-(p/3)+72 = 0
75.8-1/3*p = 0 // - 75.8
-1/3*p = -75.8 // : -1/3
p = -75.8/(-1/3)
p = 227.40000227
p = 227.40000227
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