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x in (-oo:+oo)
(1/2)*(4*a-(6*b))-((2/3)*(9*a-(3*b))) = 0
(1/2)*(4*a-6*b)+(-2/3)*(9*a-3*b) = 0
1/2*(4*a-6*b)-2/3*(9*a-3*b) = 0
1/2*(4*a-6*b)-2/3*(9*a-3*b) = 0
-4*a-b = 0
-4*a-b = 0
x belongs to the empty set
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