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x in (-oo:+oo)
(1/7)*(21*a-(7*b))-((1/3)*(12*b-(6*a))) = 0
(1/7)*(21*a-7*b)+(-1/3)*(12*b-6*a) = 0
1/7*(21*a-7*b)-1/3*(12*b-6*a) = 0
1/7*(21*a-7*b)-1/3*(12*b-6*a) = 0
5*a-5*b = 0
5*a-5*b = 0
x belongs to the empty set
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