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p in (-oo:+oo)
3.8 = p/3-7.2 // - p/3-7.2
3.8-(p/3)+7.2 = 0
11-1/3*p = 0 // - 11
-1/3*p = -11 // : -1/3
p = -11/(-1/3)
p = 33
p = 33
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