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k in (-oo:+oo)
6*(3*k+6) = 108 // - 108
6*(3*k+6)-108 = 0
6*(3*k+6)-108 = 0
18*k-72 = 0
18*k-72 = 0
18*k-72 = 0 // + 72
18*k = 72 // : 18
k = 72/18
k = 4
k = 4
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