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p in (-oo:+oo)
4-((1/2)*p) = -2/3 // + -2/3
4-((1/2)*p)-(-2/3) = 0
(-1/2)*p+2/3+4 = 0
14/3-1/2*p = 0 // - 14/3
-1/2*p = -14/3 // : -1/2
p = -14/3/(-1/2)
p = 28/3
p = 28/3
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