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b in (-oo:+oo)
1/9-(4*b) = 217/9 // - 217/9
1/9-(4*b)-(217/9) = 0
1/9-4*b-217/9 = 0
-4*b-24 = 0 // + 24
-4*b = 24 // : -4
b = 24/(-4)
b = -6
b = -6
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