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b in (-oo:+oo)
(11/4)*b-5 = 10 // - 10
(11/4)*b-10-5 = 0
11/4*b-15 = 0 // + 15
11/4*b = 15 // : 11/4
b = 15/11/4
b = 60/11
b = 60/11
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