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b in (-oo:+oo)
1/9-(4*b)-9 = 0
1/9-4*b-9 = 0
-4*b-80/9 = 0 // + 80/9
-4*b = 80/9 // : -4
b = 80/9/(-4)
b = -20/9
b = -20/9
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