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b in (-oo:+oo)
4*b-(7*b)-6 = -12 // + 12
4*b-(7*b)-6+12 = 0
4*b-7*b-6+12 = 0
6-3*b = 0 // - 6
-3*b = -6 // : -3
b = -6/(-3)
b = 2
b = 2
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