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k in (-oo:+oo)
(2/7)*k+(3/4)*k+1/5 = 463/140 // - 463/140
(2/7)*k+(3/4)*k+1/5-(463/140) = 0
(2/7)*k+(3/4)*k+1/5-463/140 = 0
29/28*k-87/28 = 0 // + 87/28
29/28*k = 87/28 // : 29/28
k = 87/28/29/28
k = 3
k = 3
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