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