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D( x )
1-d <= 0
-x/a <= 0
1-d <= 0
1-d <= 0
1-d <= 0
x należy do R
-x/a <= 0
-x/a <= 0
-x/a = 0
-a^-1*x = 0 // : -a^-1
x = 0
x <= 0
(-oo:0) (0:+oo) x - +
x belongs to the empty set
ln(-x/a) = ln(1-d)/b
x belongs to the empty set
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