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