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