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p in (-oo:+oo)
310.5 = (9/10)*p // - (9/10)*p
310.5-((9/10)*p) = 0
(-9/10)*p+310.5 = 0
310.5-9/10*p = 0 // - 310.5
-9/10*p = -310.5 // : -9/10
p = -310.5/(-9/10)
p = 345
p = 345
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