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p in (-oo:+oo)
3*p-((3/8)*p) = 2 // - 2
3*p-((3/8)*p)-2 = 0
3*p+(-3/8)*p-2 = 0
21/8*p-2 = 0 // + 2
21/8*p = 2 // : 21/8
p = 2/21/8
p = 16/21
p = 16/21
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