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k in (-oo:+oo)
6*(7*k-4) = -66 // + 66
6*(7*k-4)+66 = 0
6*(7*k-4)+66 = 0
42*k+42 = 0
42*k+42 = 0
42*k+42 = 0 // - 42
42*k = -42 // : 42
k = -42/42
k = -1
k = -1
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