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k in (-oo:+oo)
10*k-(2*k)+(2/7)*k+10/7+2/7-6 = 0
10*k-2*k+(2/7)*k+10/7+2/7-6 = 0
58/7*k-30/7 = 0 // + 30/7
58/7*k = 30/7 // : 58/7
k = 30/7/58/7
k = 15/29
k = 15/29
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