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p in (-oo:+oo)
4/12-((8/6)*p) = 2/3 // - 2/3
4/12-((8/6)*p)-(2/3) = 0
(-4/3)*p+4/12-2/3 = 0
-4/3*p-1/3 = 0 // + 1/3
-4/3*p = 1/3 // : -4/3
p = 1/3/(-4/3)
p = -1/4
p = -1/4
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