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x in (-oo:+oo)
P = (y-k)/b // - (y-k)/b
P-((y-k)/b) = 0
(-1*(y-k))/b+P = 0
(-1*(y-k))/b+(P*b)/b = 0
P*b-1*(y-k) = 0
P*b+k-y = 0
(P*b+k-y)/b = 0
(P*b+k-y)/b = 0 // * b
P*b+k-y = 0
x belongs to the empty set
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