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k in (-oo:+oo)
(3/2)*(k-7) = 3 // - 3
(3/2)*(k-7)-3 = 0
3/2*(k-7)-3 = 0
3/2*(k-7)-3 = 0
3/2*k-27/2 = 0
3/2*k-27/2 = 0
3/2*k-27/2 = 0 // + 27/2
3/2*k = 27/2 // : 3/2
k = 27/2/3/2
k = 9
k = 9
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