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