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x in (-oo:+oo)
r = (d-t)/3 // - (d-t)/3
r-((d-t)/3) = 0
(-1*(d-t))/3+r = 0
(-1*(d-t))/3+(3*r)/3 = 0
3*r-1*(d-t) = 0
3*r-d+t = 0
(3*r-d+t)/3 = 0
(3*r-d+t)/3 = 0 // * 3
3*r-d+t = 0
x belongs to the empty set
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