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b in (-oo:+oo)
6*b+8 = 3*b+35 // - 3*b+35
6*b-(3*b)-35+8 = 0
6*b-3*b-35+8 = 0
3*b-27 = 0 // + 27
3*b = 27 // : 3
b = 27/3
b = 9
b = 9
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