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k in (-oo:+oo)
-((2/7)*k)-k-3/5 = -426/35 // + -426/35
-((2/7)*k)-k-3/5-(-426/35) = 0
(-2/7)*k-k-3/5+426/35 = 0
81/7-9/7*k = 0 // - 81/7
-9/7*k = -81/7 // : -9/7
k = -81/7/(-9/7)
k = 9
k = 9
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