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P in (-oo:+oo)
40 = (1/2)*P // - (1/2)*P
40-((1/2)*P) = 0
(-1/2)*P+40 = 0
40-1/2*P = 0 // - 40
-1/2*P = -40 // : -1/2
P = -40/(-1/2)
P = 80
P = 80
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