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k in (-oo:+oo)
(1/5.2)*k+81.9 = 47.2 // - 47.2
(1/5.2)*k-47.2+81.9 = 0
0.19230769*k+34.7 = 0 // - 34.7
0.19230769*k = -34.7 // : 0.19230769
k = -34.7/0.19230769
k = -180.44000217
k = -180.44000217
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