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x in (-oo:+oo)
(1/5)*(3*r-4) = 3*d // - 3*d
(1/5)*(3*r-4)-(3*d) = 0
(1/5)*(3*r-4)-3*d = 0
1/5*(3*r-4)-3*d = 0
1/5*(3*r-4)-3*d = 0
3/5*r-3*d-4/5 = 0
3/5*r-3*d-4/5 = 0
x belongs to the empty set
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