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b in (-oo:+oo)
7*(6*b+2) = -448 // + 448
7*(6*b+2)+448 = 0
7*(6*b+2)+448 = 0
42*b+462 = 0
42*b+462 = 0
42*b+462 = 0 // - 462
42*b = -462 // : 42
b = -462/42
b = -11
b = -11
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