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b in (-oo:+oo)
3-6*b = 23-4*b // - 23-4*b
3-6*b-(-4*b)-23 = 0
4*b-6*b-23+3 = 0
-2*b-20 = 0 // + 20
-2*b = 20 // : -2
b = 20/(-2)
b = -10
b = -10
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