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k in (-oo:+oo)
4*k+2/7 = (-5/6)*k+239/126 // - (-5/6)*k+239/126
4*k-((-5/6)*k)+2/7-(239/126) = 0
4*k+(5/6)*k+2/7-239/126 = 0
29/6*k-29/18 = 0 // + 29/18
29/6*k = 29/18 // : 29/6
k = 29/18/29/6
k = 1/3
k = 1/3
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