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b in (-oo:+oo)
4*b-2 = 97-5*b // - 97-5*b
4*b-(-5*b)-97-2 = 0
4*b+5*b-97-2 = 0
9*b-99 = 0 // + 99
9*b = 99 // : 9
b = 99/9
b = 11
b = 11
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