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b in (-oo:+oo)
6*b-7 = b/4 // - b/4
6*b-(b/4)-7 = 0
23/4*b-7 = 0 // + 7
23/4*b = 7 // : 23/4
b = 7/23/4
b = 28/23
b = 28/23
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