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b in (-oo:+oo)
15 = 3*b-6*b+3 // - 3*b-6*b+3
15-(-6*b)-(3*b)-3 = 0
6*b-3*b-3+15 = 0
3*b+12 = 0 // - 12
3*b = -12 // : 3
b = -12/3
b = -4
b = -4
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