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b in (-oo:+oo)
(5/6)*(12-b)+1 = 6 // - 6
(5/6)*(12-b)-6+1 = 0
5/6*(12-b)-6+1 = 0
5/6*(12-b)-6+1 = 0
1-5/6*b+4 = 0
5-5/6*b = 0
5-5/6*b = 0
5-5/6*b = 0 // - 5
-5/6*b = -5 // : -5/6
b = -5/(-5/6)
b = 6
b = 6
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