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k in (-oo:+oo)
5*k-((3/7)*k)-1/7 = -289/7 // + -289/7
5*k-((3/7)*k)-1/7-(-289/7) = 0
(-3/7)*k+5*k-1/7+289/7 = 0
32/7*k+288/7 = 0 // - 288/7
32/7*k = -288/7 // : 32/7
k = -288/7/32/7
k = -9
k = -9
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