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b in (-oo:+oo)
6*(7*b-8) = -216 // + 216
6*(7*b-8)+216 = 0
6*(7*b-8)+216 = 0
42*b+168 = 0
42*b+168 = 0
42*b+168 = 0 // - 168
42*b = -168 // : 42
b = -168/42
b = -4
b = -4
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