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b in (-oo:+oo)
(11/5)*b = 1/2 // - 1/2
(11/5)*b-(1/2) = 0
(11/5)*b-1/2 = 0
11/5*b-1/2 = 0 // + 1/2
11/5*b = 1/2 // : 11/5
b = 1/2/11/5
b = 5/22
b = 5/22
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