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k in (-oo:+oo)
((3/4)*k+8)^2 = 0
(3/4*k+8)^2 = 0
3/4*k+8 = 0 // - 8
3/4*k = -8 // : 3/4
k = -8/3/4
k = -32/3
k in { -32/3, -32/3 }
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