जर \(\rm 7a - {7\over a} + 4 = 0\), तर \(\rm a^3 - {1 \over a^3} - 1\) शोधा.

1
\(-995 \over 343\)
2
\(-875 \over 248\)
3
\(-694 \over 315\)
4
\(-765 \over 262\)

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