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k in (-oo:+oo)
k/6.1 = 57 // - 57
k/6.1-57 = 0
0.16393443*k-57 = 0 // + 57
0.16393443*k = 57 // : 0.16393443
k = 57/0.16393443
k = 347.699992
k = 347.699992
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