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k in (-oo:+oo)
(-6/7)*k+4 = 74/21 // - 74/21
(-6/7)*k-(74/21)+4 = 0
(-6/7)*k-74/21+4 = 0
10/21-6/7*k = 0 // - 10/21
-6/7*k = -10/21 // : -6/7
k = -10/21/(-6/7)
k = 5/9
k = 5/9
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