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P in (-oo:+oo)
P/8 = 13/2 // - 13/2
P/8-(13/2) = 0
P/8-13/2 = 0
1/8*P-13/2 = 0 // + 13/2
1/8*P = 13/2 // : 1/8
P = 13/2/1/8
P = 52
P = 52
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