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b in (-oo:+oo)
10/11 = b/21 // - b/21
10/11-(b/21) = 0
10/11-1/21*b = 0 // - 10/11
-1/21*b = -10/11 // : -1/21
b = -10/11/(-1/21)
b = 210/11
b = 210/11
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