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b in (-oo:+oo)
3*b+9 = 18-6*b // - 18-6*b
3*b-(-6*b)-18+9 = 0
3*b+6*b-18+9 = 0
9*b-9 = 0 // + 9
9*b = 9 // : 9
b = 9/9
b = 1
b = 1
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