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p in (-oo:+oo)
11-((2/3)*p) = 3*p // - 3*p
11-((2/3)*p)-(3*p) = 0
(-2/3)*p-3*p+11 = 0
11-11/3*p = 0 // - 11
-11/3*p = -11 // : -11/3
p = -11/(-11/3)
p = 3
p = 3
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