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k in (-oo:+oo)
k/5.2+81 = 47.2 // - 47.2
k/5.2-47.2+81 = 0
0.19230769*k+33.8 = 0 // - 33.8
0.19230769*k = -33.8 // : 0.19230769
k = -33.8/0.19230769
k = -175.76000211
k = -175.76000211
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