If \( 6 x^{2}-3 x-1 \) is a factor of \( a x^{3}+b x-1 \) (where \( a, b \) are integers), then ...

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If \( 6 x^{2}-3 x-1 \) is a factor of \( a x^{3}+b x-1 \) (where \( a, b \) are integers), then find the value of \( b \).
(a) 1
(b) 3
(c) \( -5 \)
(d) \( -7 \)
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