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k in (-oo:+oo)
k/10 = 8/4 // - 8/4
k/10-(8/4) = 0
k/10-2 = 0
1/10*k-2 = 0 // + 2
1/10*k = 2 // : 1/10
k = 2/1/10
k = 20
k = 20
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