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b in (-oo:+oo)
2*b+5/9 = -b-19/9 // + -b-19/9
2*b+b+5/9-(-19/9) = 0
2*b+b+5/9+19/9 = 0
3*b+8/3 = 0 // - 8/3
3*b = -8/3 // : 3
b = -8/3/3
b = -8/9
b = -8/9
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