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b in (-oo:+oo)
(4/5)*b = 6/9 // - 6/9
(4/5)*b-(6/9) = 0
(4/5)*b-2/3 = 0
4/5*b-2/3 = 0 // + 2/3
4/5*b = 2/3 // : 4/5
b = 2/3/4/5
b = 5/6
b = 5/6
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