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P in (-oo:+oo)
P/(-4) = 4.2 // - 4.2
P/(-4)-4.2 = 0
-1/4*P-4.2 = 0 // + 4.2
-1/4*P = 4.2 // : -1/4
P = 4.2/(-1/4)
P = -16.8
P = -16.8
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