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b in (-oo:+oo)
-12 = b/9-10 // - b/9-10
10-(b/9)-12 = 0
-1/9*b-2 = 0 // + 2
-1/9*b = 2 // : -1/9
b = 2/(-1/9)
b = -18
b = -18
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