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k in (-oo:+oo)
3*(7*k-6) = 3 // - 3
3*(7*k-6)-3 = 0
3*(7*k-6)-3 = 0
21*k-21 = 0
21*k-21 = 0
21*k-21 = 0 // + 21
21*k = 21 // : 21
k = 21/21
k = 1
k = 1
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