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a in (-oo:+oo)
(12/6)*(3*a+4) = 6*a+8 // - 6*a+8
(12/6)*(3*a+4)-(6*a)-8 = 0
(12/6)*(3*a+4)-6*a-8 = 0
2*(3*a+4)-6*a-8 = 0
2*(3*a+4)-6*a-8 = 0
8-8 = 0
0 = 0
0 = 0
a belongs to the empty set
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