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k in (-oo:+oo)
k/72 = 0.8 // - 0.8
k/72-0.8 = 0
1/72*k-0.8 = 0 // + 0.8
1/72*k = 0.8 // : 1/72
k = 0.8/1/72
k = 57.59999539
k = 57.59999539
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