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k in (-oo:+oo)
-(2*k)-2 = -22 // + 22
22-(2*k)-2 = 0
22-2*k-2 = 0
20-2*k = 0 // - 20
-2*k = -20 // : -2
k = -20/(-2)
k = 10
k = 10
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