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P in (-oo:+oo)
12 = (5*P)/4 // - (5*P)/4
12-((5*P)/4) = 0
(-5/4)*P+12 = 0
12-5/4*P = 0 // - 12
-5/4*P = -12 // : -5/4
P = -12/(-5/4)
P = 48/5
P = 48/5
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