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p in (-oo:+oo)
11.3-(p/28) = 1.5 // - 1.5
11.3-(p/28)-1.5 = 0
9.8-1/28*p = 0 // - 9.8
-1/28*p = -9.8 // : -1/28
p = -9.8/(-1/28)
p = 274.39996707
p = 274.39996707
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