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