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k in (-oo:+oo)
6-((2/3)*k) = 6*k+338/33 // - 6*k+338/33
6-((2/3)*k)-(6*k)-(338/33) = 0
(-2/3)*k-6*k-338/33+6 = 0
-20/3*k-140/33 = 0 // + 140/33
-20/3*k = 140/33 // : -20/3
k = 140/33/(-20/3)
k = -7/11
k = -7/11
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