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x in (-oo:+oo)
R = (1-t)/C // - (1-t)/C
R-((1-t)/C) = 0
(-1*(1-t))/C+R = 0
(-1*(1-t))/C+(C*R)/C = 0
C*R-1*(1-t) = 0
C*R+t-1 = 0
(C*R+t-1)/C = 0
(C*R+t-1)/C = 0 // * C
C*R+t-1 = 0
x belongs to the empty set
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