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b in (-oo:+oo)
5*b+4 = -6*b-84 // + -6*b-84
5*b-(-6*b)+4+84 = 0
5*b+6*b+4+84 = 0
11*b+88 = 0 // - 88
11*b = -88 // : 11
b = -88/11
b = -8
b = -8
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