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k in (-oo:+oo)
(3/4)*(k-3) = 9 // - 9
(3/4)*(k-3)-9 = 0
3/4*(k-3)-9 = 0
3/4*(k-3)-9 = 0
3/4*k-45/4 = 0
3/4*k-45/4 = 0
3/4*k-45/4 = 0 // + 45/4
3/4*k = 45/4 // : 3/4
k = 45/4/3/4
k = 15
k = 15
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