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Two sides of a rhombus are along the lines, $x−y+1=0$ and $7x−y−5=0$. If its diagonals intersect at $(−1, −2)$, then which one of the following is a vertex of this rhombus ?

( A ) $(-3, -9)
( B ) $(-\frac{10}{3}, -\frac{7}{3})$
( C ) $(-3, -8)$
( D ) $(\frac{1}{3}, -\frac{8}{3})$

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