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x in (-oo:+oo)
s = (f-t)/u // - (f-t)/u
s-((f-t)/u) = 0
(-1*(f-t))/u+s = 0
(-1*(f-t))/u+(s*u)/u = 0
s*u-1*(f-t) = 0
t-f+s*u = 0
(t-f+s*u)/u = 0
(t-f+s*u)/u = 0 // * u
t-f+s*u = 0
x belongs to the empty set
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