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k in (-oo:+oo)
-(2*k)-2 = 14 // - 14
-(2*k)-14-2 = 0
-2*k-14-2 = 0
-2*k-16 = 0 // + 16
-2*k = 16 // : -2
k = 16/(-2)
k = -8
k = -8
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