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p in (-oo:+oo)
(2/3)*p = 9/4-(3/8) // - 9/4-(3/8)
(2/3)*p-(9/4)+3/8 = 0
(2/3)*p-9/4+3/8 = 0
2/3*p-15/8 = 0 // + 15/8
2/3*p = 15/8 // : 2/3
p = 15/8/2/3
p = 45/16
p = 45/16
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