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k in (-oo:+oo)
k/12 = 25/100 // - 25/100
k/12-(25/100) = 0
k/12-1/4 = 0
1/12*k-1/4 = 0 // + 1/4
1/12*k = 1/4 // : 1/12
k = 1/4/1/12
k = 3
k = 3
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