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k in (-oo:+oo)
(6/7)*k = 3/4 // - 3/4
(6/7)*k-(3/4) = 0
(6/7)*k-3/4 = 0
6/7*k-3/4 = 0 // + 3/4
6/7*k = 3/4 // : 6/7
k = 3/4/6/7
k = 7/8
k = 7/8
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