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b in (-oo:+oo)
(2/9)*b = 1/9 // - 1/9
(2/9)*b-(1/9) = 0
(2/9)*b-1/9 = 0
2/9*b-1/9 = 0 // + 1/9
2/9*b = 1/9 // : 2/9
b = 1/9/2/9
b = 1/2
b = 1/2
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