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k in (-oo:+oo)
(-3/7)*k = -1/14 // + -1/14
(-3/7)*k-(-1/14) = 0
(-3/7)*k+1/14 = 0
1/14-3/7*k = 0 // - 1/14
-3/7*k = -1/14 // : -3/7
k = -1/14/(-3/7)
k = 1/6
k = 1/6
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