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b in (-oo:+oo)
4/9-3*b-(2*b) = -67/18 // + -67/18
4/9-3*b-(2*b)-(-67/18) = 0
4/9-3*b-2*b+67/18 = 0
25/6-5*b = 0 // - 25/6
-5*b = -25/6 // : -5
b = -25/6/(-5)
b = 5/6
b = 5/6
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