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k in (-oo:+oo)
(1/4)*k-((5/7)*k)+6 = 11/4 // - 11/4
(1/4)*k-((5/7)*k)-(11/4)+6 = 0
(-5/7)*k+(1/4)*k-11/4+6 = 0
13/4-13/28*k = 0 // - 13/4
-13/28*k = -13/4 // : -13/28
k = -13/4/(-13/28)
k = 7
k = 7
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