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b in (-oo:+oo)
(b+9)/5 = b-2 // - b-2
(b+9)/5-b+2 = 0
(b+9)/5+(5*(-b))/5+(2*5)/5 = 0
b+5*(-b)+2*5+9 = 0
9-4*b+10 = 0
19-4*b = 0
(19-4*b)/5 = 0
(19-4*b)/5 = 0 // * 5
19-4*b = 0
19-4*b = 0 // - 19
-4*b = -19 // : -4
b = -19/(-4)
b = 19/4
b = 19/4
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