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k in (-oo:+oo)
7*k+24 = k/4 // - k/4
7*k-(k/4)+24 = 0
27/4*k+24 = 0 // - 24
27/4*k = -24 // : 27/4
k = -24/27/4
k = -32/9
k = -32/9
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