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k in (-oo:+oo)
5-((2/3)*(2*k-1)) = 7 // - 7
5-((2/3)*(2*k-1))-7 = 0
(-2/3)*(2*k-1)-7+5 = 0
5-2/3*(2*k-1)-7 = 0
5-2/3*(2*k-1)-7 = 0
5-4/3*k-19/3 = 0
-4/3*k-4/3 = 0
-4/3*k-4/3 = 0
-4/3*k-4/3 = 0 // + 4/3
-4/3*k = 4/3 // : -4/3
k = 4/3/(-4/3)
k = -1
k = -1
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