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k in (-oo:+oo)
k/25 = 7/17.5 // - 7/17.5
k/25-(7/17.5) = 0
k/25-0.4 = 0
1/25*k-0.4 = 0 // + 0.4
1/25*k = 0.4 // : 1/25
k = 0.4/1/25
k = 10
k = 10
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