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x in (-oo:+oo)
5*a+3*b = (2/3)*(3*b-(2*a)) // - (2/3)*(3*b-(2*a))
5*a-((2/3)*(3*b-(2*a)))+3*b = 0
(-2/3)*(3*b-2*a)+5*a+3*b = 0
5*a-2/3*(3*b-2*a)+3*b = 0
5*a-2/3*(3*b-2*a)+3*b = 0
19/3*a-2*b+3*b = 0
19/3*a+b = 0
19/3*a+b = 0
x belongs to the empty set
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