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b in (-oo:+oo)
b/11-(6/11) = 15/11 // - 15/11
b/11-(6/11)-(15/11) = 0
b/11-6/11-15/11 = 0
1/11*b-21/11 = 0 // + 21/11
1/11*b = 21/11 // : 1/11
b = 21/11/1/11
b = 21
b = 21
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