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p in (-oo:+oo)
(1-(4*p))/5 < 0.2 // - 0.2
(1-(4*p))/5-0.2 < 0
(1-4*p)/5-0.2 < 0
(1-4*p)/5+(-0.2*5)/5 < 0
1-4*p-0.2*5 < 0
-4*p < 0
(-4*p)/5 < 0
(-4*p)/5 < 0 // * 5^2
-4*5*p < 0
( -4*p )
0-4*p < 0 // - 0
-4*p < 0 // : -4
p > 0/(-4)
p > 0
( 5 )
5 < 0
p belongs to the empty set
(-oo:0) (0:+oo) -4*p + - 5 + +
p in (0:+oo)
(0:+oo)
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