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b in (-oo:+oo)
(2*b+9)/11 = 18 // - 18
(2*b+9)/11-18 = 0
(2*b+9)/11+(-18*11)/11 = 0
2*b-18*11+9 = 0
2*b-189 = 0
(2*b-189)/11 = 0
(2*b-189)/11 = 0 // * 11
2*b-189 = 0
2*b-189 = 0 // + 189
2*b = 189 // : 2
b = 189/2
b = 189/2
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