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b in (-oo:+oo)
50*(b-3) = 5/2 // - 5/2
50*(b-3)-(5/2) = 0
50*(b-3)-5/2 = 0
(2*50*(b-3))/2-5/2 = 0
2*50*(b-3)-5 = 0
100*b-305 = 0
(100*b-305)/2 = 0
(100*b-305)/2 = 0 // * 2
100*b-305 = 0
100*b-305 = 0 // + 305
100*b = 305 // : 100
b = 305/100
b = 61/20
b = 61/20
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