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b in (-oo:+oo)
6*b-7 = 3*b-28 // - 3*b-28
6*b-(3*b)-7+28 = 0
6*b-3*b-7+28 = 0
3*b+21 = 0 // - 21
3*b = -21 // : 3
b = -21/3
b = -7
b = -7
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