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b in (-oo:+oo)
(4/5)*b-5 = 6 // - 6
(4/5)*b-6-5 = 0
4/5*b-11 = 0 // + 11
4/5*b = 11 // : 4/5
b = 11/4/5
b = 55/4
b = 55/4
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