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