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k in (-oo:+oo)
(-3/7)*k+2/3 = 13/33 // - 13/33
(-3/7)*k+2/3-(13/33) = 0
(-3/7)*k+2/3-13/33 = 0
3/11-3/7*k = 0 // - 3/11
-3/7*k = -3/11 // : -3/7
k = -3/11/(-3/7)
k = 7/11
k = 7/11
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