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b in (-oo:+oo)
9 = 8*b-(5/3) // - 8*b-(5/3)
5/3-(8*b)+9 = 0
5/3-8*b+9 = 0
32/3-8*b = 0 // - 32/3
-8*b = -32/3 // : -8
b = -32/3/(-8)
b = 4/3
b = 4/3
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