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k in (-oo:+oo)
-49/36 = (-1/2)*k-((2/3)*k)-(7/9) // - (-1/2)*k-((2/3)*k)-(7/9)
(2/3)*k-((-1/2)*k)-49/36+7/9 = 0
(1/2)*k+(2/3)*k-49/36+7/9 = 0
7/6*k-7/12 = 0 // + 7/12
7/6*k = 7/12 // : 7/6
k = 7/12/7/6
k = 1/2
k = 1/2
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