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k in (-oo:+oo)
(-1/3)*k-(7/9) = 20/9 // - 20/9
(-1/3)*k-(7/9)-(20/9) = 0
(-1/3)*k-7/9-20/9 = 0
-1/3*k-3 = 0 // + 3
-1/3*k = 3 // : -1/3
k = 3/(-1/3)
k = -9
k = -9
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