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b in (-oo:+oo)
3 = 3*b+b-5 // - 3*b+b-5
3-(3*b)-b+5 = 0
3-3*b-b+5 = 0
8-4*b = 0 // - 8
-4*b = -8 // : -4
b = -8/(-4)
b = 2
b = 2
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