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k in (-oo:+oo)
(1/3)*(k-9) = 3 // - 3
(1/3)*(k-9)-3 = 0
1/3*(k-9)-3 = 0
1/3*(k-9)-3 = 0
1/3*k-6 = 0
1/3*k-6 = 0
1/3*k-6 = 0 // + 6
1/3*k = 6 // : 1/3
k = 6/1/3
k = 18
k = 18
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