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P in (-oo:+oo)
P/3 = 12/4 // - 12/4
P/3-(12/4) = 0
P/3-3 = 0
1/3*P-3 = 0 // + 3
1/3*P = 3 // : 1/3
P = 3/1/3
P = 9
P = 9
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