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b in (-oo:+oo)
(4/5)*b-(5/9) = -457/45 // + -457/45
(4/5)*b-(5/9)-(-457/45) = 0
(4/5)*b-5/9+457/45 = 0
4/5*b+48/5 = 0 // - 48/5
4/5*b = -48/5 // : 4/5
b = -48/5/4/5
b = -12
b = -12
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