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k in (-oo:+oo)
6*k-(2*k)+10 = 38/5 // - 38/5
6*k-(2*k)-(38/5)+10 = 0
6*k-2*k-38/5+10 = 0
4*k+12/5 = 0 // - 12/5
4*k = -12/5 // : 4
k = -12/5/4
k = -3/5
k = -3/5
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