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b in (-oo:+oo)
(1/6)*b-(5/9) = 17/18 // - 17/18
(1/6)*b-(5/9)-(17/18) = 0
(1/6)*b-5/9-17/18 = 0
1/6*b-3/2 = 0 // + 3/2
1/6*b = 3/2 // : 1/6
b = 3/2/1/6
b = 9
b = 9
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