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k in (-oo:+oo)
45/28 = k+6/7 // - k+6/7
45/28-k-(6/7) = 0
45/28-k-6/7 = 0
3/4-k = 0 // - 3/4
-k = -3/4 // * -1
k = 3/4
k = 3/4
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