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/3.9+78.6 = 18.7 // - 18.7
k/3.9-18.7+78.6 = 0
0.25641026*k+59.9 = 0 // - 59.9
0.25641026*k = -59.9 // : 0.25641026
k = -59.9/0.25641026
k = -233.60999673
k = -233.60999673
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