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k in (-oo:+oo)
(4/7)*k+k+3/5 = 186/35 // - 186/35
(4/7)*k+k+3/5-(186/35) = 0
(4/7)*k+k+3/5-186/35 = 0
11/7*k-33/7 = 0 // + 33/7
11/7*k = 33/7 // : 11/7
k = 33/7/11/7
k = 3
k = 3
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