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k in (-oo:+oo)
(2/3)*k-((5/6)*k)-1/3 = -7/22 // + -7/22
(2/3)*k-((5/6)*k)-1/3-(-7/22) = 0
(2/3)*k+(-5/6)*k-1/3+7/22 = 0
-1/6*k-1/66 = 0 // + 1/66
-1/6*k = 1/66 // : -1/6
k = 1/66/(-1/6)
k = -1/11
k = -1/11
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