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p in (-oo:+oo)
-((2/5)*p)-9 < 9/10 // - 9/10
-((2/5)*p)-(9/10)-9 < 0
(-2/5)*p-9/10-9 < 0
-2/5*p-99/10 < 0 // + 99/10
-2/5*p < 99/10 // : -2/5
p > 99/10/(-2/5)
p > -99/4
p in (-99/4:+oo)
(-99/4:+oo)
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