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k in (-oo:+oo)
k/4 = 6/7 // - 6/7
k/4-(6/7) = 0
k/4-6/7 = 0
1/4*k-6/7 = 0 // + 6/7
1/4*k = 6/7 // : 1/4
k = 6/7/1/4
k = 24/7
k = 24/7
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