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k in (-oo:+oo)
k-(2*k)-(2/(-2)) = 0.25 // - 0.25
k-(2*k)-(2/(-2))-0.25 = 0
k-2*k-0.25+1 = 0
0.75-k = 0 // - 0.75
-k = -0.75 // * -1
k = 0.75
k = 0.75
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