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P in (-oo:+oo)
P/4 = 1.5 // - 1.5
P/4-1.5 = 0
1/4*P-1.5 = 0 // + 1.5
1/4*P = 1.5 // : 1/4
P = 1.5/1/4
P = 6
P = 6
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