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p in (-oo:+oo)
9/4-(3/8) = (5/8)*p // - (5/8)*p
9/4-((5/8)*p)-(3/8) = 0
(-5/8)*p+9/4-3/8 = 0
15/8-5/8*p = 0 // - 15/8
-5/8*p = -15/8 // : -5/8
p = -15/8/(-5/8)
p = 3
p = 3
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