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p in (-oo:+oo)
320.4 = (9/10)*p // - (9/10)*p
320.4-((9/10)*p) = 0
(-9/10)*p+320.4 = 0
320.4-9/10*p = 0 // - 320.4
-9/10*p = -320.4 // : -9/10
p = -320.4/(-9/10)
p = 356
p = 356
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