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k in (-oo:+oo)
7 = 2*(k/4) // - 2*(k/4)
7-(2*(k/4)) = 0
(-1/2)*k+7 = 0
7-1/2*k = 0 // - 7
-1/2*k = -7 // : -1/2
k = -7/(-1/2)
k = 14
k = 14
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