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b in (-oo:+oo)
3*b-(6*b)-2 = -8/3 // + -8/3
3*b-(6*b)-(-8/3)-2 = 0
3*b-6*b+8/3-2 = 0
2/3-3*b = 0 // - 2/3
-3*b = -2/3 // : -3
b = -2/3/(-3)
b = 2/9
b = 2/9
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