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x in (-oo:+oo)
R = 5*(c/a-0.3) // - 5*(c/a-0.3)
R-(5*(c/a-0.3)) = 0
R-5*(c/a-0.3) = 0
R-5*(a^-1*c-0.3) = 0
R-5*(a^-1*c-0.3) = 0
R-5*a^-1*c+1.5 = 0
R-5*a^-1*c+1.5 = 0
x belongs to the empty set
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