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