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b in (-oo:+oo)
3*b+2/9 = 137/9 // - 137/9
3*b+2/9-(137/9) = 0
3*b+2/9-137/9 = 0
3*b-15 = 0 // + 15
3*b = 15 // : 3
b = 15/3
b = 5
b = 5
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