If it's not what You are looking for type in the equation solver your own equation and let us solve it.
k in (-oo:+oo)
k/4.6 = -0.25 // + 0.25
k/4.6+0.25 = 0
0.2173913*k+0.25 = 0 // - 0.25
0.2173913*k = -0.25 // : 0.2173913
k = -0.25/0.2173913
k = -1.15000002
k = -1.15000002
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