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b in (-oo:+oo)
5*b-(2/9) = -49/18 // + -49/18
5*b-(2/9)-(-49/18) = 0
5*b-2/9+49/18 = 0
5*b+5/2 = 0 // - 5/2
5*b = -5/2 // : 5
b = -5/2/5
b = -1/2
b = -1/2
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