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b in (-oo:+oo)
(5/6)*(b-6) = 10 // - 10
(5/6)*(b-6)-10 = 0
5/6*(b-6)-10 = 0
5/6*(b-6)-10 = 0
5/6*b-15 = 0
5/6*b-15 = 0
5/6*b-15 = 0 // + 15
5/6*b = 15 // : 5/6
b = 15/5/6
b = 18
b = 18
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