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b in (-oo:+oo)
4 = 3*b-6*b+1 // - 3*b-6*b+1
4-(-6*b)-(3*b)-1 = 0
6*b-3*b-1+4 = 0
3*b+3 = 0 // - 3
3*b = -3 // : 3
b = -3/3
b = -1
b = -1
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