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b in (-oo:+oo)
-(3*b)-6 = b-26 // - b-26
26-(3*b)-b-6 = 0
26-3*b-b-6 = 0
20-4*b = 0 // - 20
-4*b = -20 // : -4
b = -20/(-4)
b = 5
b = 5
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