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b in (-oo:+oo)
41 = b-4*b+5 // - b-4*b+5
41-(-4*b)-b-5 = 0
4*b-b-5+41 = 0
3*b+36 = 0 // - 36
3*b = -36 // : 3
b = -36/3
b = -12
b = -12
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