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b in (-oo:+oo)
4*b-(5*b)+4 = 13 // - 13
4*b-(5*b)-13+4 = 0
4*b-5*b-13+4 = 0
-b-9 = 0 // + 9
-b = 9 // * -1
b = -9
b = -9
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