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Find the numerical coefficient of each of the following terms: \(-3yx\), \(12k\), \(y\), \(121bc\), \(-x\), \(9pq\), \(2ab\).
 
\(-3yx\)
\(12k\)
\(y\)
\(121bc\)
\(-x\)
\(9pq\)
\(2ab\)