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k in (-oo:+oo)
3*k+k-(8/14)+5/7+1/2 = 0
3*k+k-4/7+5/7+1/2 = 0
4*k+9/14 = 0 // - 9/14
4*k = -9/14 // : 4
k = -9/14/4
k = -9/56
k = -9/56
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