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b in (-oo:+oo)
9-4*b = 29/5 // - 29/5
9-4*b-(29/5) = 0
9-4*b-29/5 = 0
16/5-4*b = 0 // - 16/5
-4*b = -16/5 // : -4
b = -16/5/(-4)
b = 4/5
b = 4/5
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