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k in (-oo:+oo)
2*k+6/7 = -1/7 // + -1/7
2*k+6/7-(-1/7) = 0
2*k+6/7+1/7 = 0
2*k+1 = 0 // - 1
2*k = -1 // : 2
k = -1/2
k = -1/2
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