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k in (-oo:+oo)
(-2/3)*k+1/3 = 7/9 // - 7/9
(-2/3)*k+1/3-(7/9) = 0
(-2/3)*k+1/3-7/9 = 0
-2/3*k-4/9 = 0 // + 4/9
-2/3*k = 4/9 // : -2/3
k = 4/9/(-2/3)
k = -2/3
k = -2/3
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