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b in (-oo:+oo)
(5/6)*b-5 = -53/12 // + -53/12
(5/6)*b-(-53/12)-5 = 0
(5/6)*b+53/12-5 = 0
5/6*b-7/12 = 0 // + 7/12
5/6*b = 7/12 // : 5/6
b = 7/12/5/6
b = 7/10
b = 7/10
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