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x in (-oo:+oo)
(6/7)*(4*a-(3*b))-((3/7)*(8*a-(6*b))) = 0
(6/7)*(4*a-3*b)+(-3/7)*(8*a-6*b) = 0
6/7*(4*a-3*b)-3/7*(8*a-6*b) = 0
6/7*(4*a-3*b)-3/7*(8*a-6*b) = 0
0 = 0
0 = 0
x belongs to the empty set
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