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k in (-oo:+oo)
(-1/2)*k-(4/7) = -57/14 // + -57/14
(-1/2)*k-(4/7)-(-57/14) = 0
(-1/2)*k-4/7+57/14 = 0
7/2-1/2*k = 0 // - 7/2
-1/2*k = -7/2 // : -1/2
k = -7/2/(-1/2)
k = 7
k = 7
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