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b in (-oo:+oo)
3*b-(6/7) = 2*b+6/8 // - 2*b+6/8
3*b-(2*b)-(6/7)-(6/8) = 0
3*b-2*b-6/7-3/4 = 0
b-45/28 = 0 // + 45/28
b = 45/28
b = 45/28
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