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P in (-oo:+oo)
P/12 = -1.27 // + 1.27
P/12+1.27 = 0
1/12*P+1.27 = 0 // - 1.27
1/12*P = -1.27 // : 1/12
P = -1.27/1/12
P = -15.24000061
P = -15.24000061
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