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D( p )
0.5-(0.3*p) = 0
0.5-(0.3*p) = 0
0.5-(0.3*p) = 0
0.5-0.3*p = 0
0.5-0.3*p = 0 // - 0.5
-0.3*p = -0.5 // : -0.3
p = -0.5/(-0.3)
p = 1.66666667
p in (-oo:1.66666667) U (1.66666667:+oo)
(0.5-(0.5*p))/(0.5-(0.3*p)) = 0
(0.5-0.5*p)/(0.5-0.3*p) = 0
0.5-0.5*p = 0 // - 0.5
-0.5*p = -0.5 // : -0.5
p = -0.5/(-0.5)
p = 1
p = 1
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