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p in (-oo:+oo)
1-((4*p)/5) < 0.2 // - 0.2
1-((4*p)/5)-0.2 < 0
(-4/5)*p-0.2+1 < 0
0.8-4/5*p < 0 // - 0.8
-4/5*p < -0.8 // : -4/5
p > -0.8/(-4/5)
p > 1
p in (1:+oo)
(1:+oo)
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