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p in (-oo:+oo)
(3/8)*p-5 = (1/8)*p-5 // - (1/8)*p-5
(3/8)*p-((1/8)*p)-5+5 = 0
(3/8)*p+(-1/8)*p-5+5 = 0
1/4*p = 0 // : 1/4
p = 0
p = 0
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