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k in (-oo:+oo)
10*k = 8/4 // - 8/4
10*k-(8/4) = 0
10*k-2 = 0
10*k-2 = 0 // + 2
10*k = 2 // : 10
k = 2/10
k = 1/5
k = 1/5
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