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