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b in (-oo:+oo)
6/11-((6*b)/11) = 20/11 // - 20/11
6/11-((6*b)/11)-(20/11) = 0
(-6/11)*b+6/11-20/11 = 0
-6/11*b-14/11 = 0 // + 14/11
-6/11*b = 14/11 // : -6/11
b = 14/11/(-6/11)
b = -7/3
b = -7/3
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