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k in (-oo:+oo)
-3 = k/4+5 // - k/4+5
-(k/4)-5-3 = 0
-1/4*k-8 = 0 // + 8
-1/4*k = 8 // : -1/4
k = 8/(-1/4)
k = -32
k = -32
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