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k in (-oo:+oo)
(4/7)*k-2/3 = -46/105 // + -46/105
(4/7)*k-2/3-(-46/105) = 0
(4/7)*k-2/3+46/105 = 0
4/7*k-8/35 = 0 // + 8/35
4/7*k = 8/35 // : 4/7
k = 8/35/4/7
k = 2/5
k = 2/5
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