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k in (-oo:+oo)
6*(3*k+6) = -18 // + 18
6*(3*k+6)+18 = 0
6*(3*k+6)+18 = 0
18*k+54 = 0
18*k+54 = 0
18*k+54 = 0 // - 54
18*k = -54 // : 18
k = -54/18
k = -3
k = -3
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