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b in (-oo:+oo)
9-(2*b) = -6*b-19 // + -6*b-19
9-(2*b)-(-6*b)+19 = 0
6*b-2*b+9+19 = 0
4*b+28 = 0 // - 28
4*b = -28 // : 4
b = -28/4
b = -7
b = -7
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