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b in (-oo:+oo)
(3/5)*b-(1/2) = 9/5 // - 9/5
(3/5)*b-(1/2)-(9/5) = 0
(3/5)*b-1/2-9/5 = 0
3/5*b-23/10 = 0 // + 23/10
3/5*b = 23/10 // : 3/5
b = 23/10/3/5
b = 23/6
b = 23/6
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