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b in (-oo:+oo)
b/11-((7*b)/11) = 12/11 // - 12/11
b/11-((7*b)/11)-(12/11) = 0
b/11+(-7/11)*b-12/11 = 0
-6/11*b-12/11 = 0 // + 12/11
-6/11*b = 12/11 // : -6/11
b = 12/11/(-6/11)
b = -2
b = -2
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