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k in (-oo:+oo)
2-2*k-(2*k) = 10 // - 10
2-2*k-(2*k)-10 = 0
2-2*k-2*k-10 = 0
-4*k-8 = 0 // + 8
-4*k = 8 // : -4
k = 8/(-4)
k = -2
k = -2
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