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k in (-oo:+oo)
2*k+8 = 70/11 // - 70/11
2*k-(70/11)+8 = 0
2*k-70/11+8 = 0
2*k+18/11 = 0 // - 18/11
2*k = -18/11 // : 2
k = -18/11/2
k = -9/11
k = -9/11
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