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k in (-oo:+oo)
(4/7)*k-2/5 = -24/35 // + -24/35
(4/7)*k-2/5-(-24/35) = 0
(4/7)*k-2/5+24/35 = 0
4/7*k+2/7 = 0 // - 2/7
4/7*k = -2/7 // : 4/7
k = -2/7/4/7
k = -1/2
k = -1/2
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