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k in (-oo:+oo)
-k/14 = 2/20 // - 2/20
-k/14-(2/20) = 0
-k/14-1/10 = 0
-1/14*k-1/10 = 0 // + 1/10
-1/14*k = 1/10 // : -1/14
k = 1/10/(-1/14)
k = -7/5
k = -7/5
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