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k in (-oo:+oo)
4*k = -3/4 // + -3/4
4*k-(-3/4) = 0
4*k+3/4 = 0
4*k+3/4 = 0 // - 3/4
4*k = -3/4 // : 4
k = -3/4/4
k = -3/16
k = -3/16
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