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k in (-oo:+oo)
9.1 = k/3.7+41 // - k/3.7+41
9.1-(k/3.7)-41 = 0
9.1-0.27027027*k-41 = 0
-0.27027027*k-31.9 = 0 // + 31.9
-0.27027027*k = 31.9 // : -0.27027027
k = 31.9/(-0.27027027)
k = -118.03000012
k = -118.03000012
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