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b in (-oo:+oo)
49 = -2*b-(6*b)-7 // + -2*b-(6*b)-7
6*b-(-2*b)+7+49 = 0
2*b+6*b+7+49 = 0
8*b+56 = 0 // - 56
8*b = -56 // : 8
b = -56/8
b = -7
b = -7
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