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k in (-oo:+oo)
(5/7)*k-((1/4)*k)+4 = 1487/336 // - 1487/336
(5/7)*k-((1/4)*k)-(1487/336)+4 = 0
(5/7)*k+(-1/4)*k-1487/336+4 = 0
13/28*k-143/336 = 0 // + 143/336
13/28*k = 143/336 // : 13/28
k = 143/336/13/28
k = 11/12
k = 11/12
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