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k in (-oo:+oo)
k/5 = 2.5 // - 2.5
k/5-2.5 = 0
1/5*k-2.5 = 0 // + 2.5
1/5*k = 2.5 // : 1/5
k = 2.5/1/5
k = 12.5
k = 12.5
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