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k in (-oo:+oo)
(-1/2)*k-3 = -13/4 // + -13/4
(-1/2)*k-(-13/4)-3 = 0
(-1/2)*k+13/4-3 = 0
1/4-1/2*k = 0 // - 1/4
-1/2*k = -1/4 // : -1/2
k = -1/4/(-1/2)
k = 1/2
k = 1/2
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