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k in (-oo:+oo)
-22/3 = 7*k+(2/3)*k+1/3 // - 7*k+(2/3)*k+1/3
-(7*k)-((2/3)*k)-22/3-(1/3) = 0
(-2/3)*k-7*k-22/3-1/3 = 0
-23/3*k-23/3 = 0 // + 23/3
-23/3*k = 23/3 // : -23/3
k = 23/3/(-23/3)
k = -1
k = -1
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