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k in (-oo:+oo)
6*(3*k-6) = 90 // - 90
6*(3*k-6)-90 = 0
6*(3*k-6)-90 = 0
18*k-126 = 0
18*k-126 = 0
18*k-126 = 0 // + 126
18*k = 126 // : 18
k = 126/18
k = 7
k = 7
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