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p in (-oo:+oo)
p/3-(4*p)+3 = 1-p-(7/2) // - 1-p-(7/2)
p/3-(4*p)+p+7/2-1+3 = 0
p/3-4*p+p+7/2-1+3 = 0
11/2-8/3*p = 0 // - 11/2
-8/3*p = -11/2 // : -8/3
p = -11/2/(-8/3)
p = 33/16
p = 33/16
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