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