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b in (-oo:+oo)
(3/5)*b+4/9 = -169/45 // + -169/45
(3/5)*b+4/9-(-169/45) = 0
(3/5)*b+4/9+169/45 = 0
3/5*b+21/5 = 0 // - 21/5
3/5*b = -21/5 // : 3/5
b = -21/5/3/5
b = -7
b = -7
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