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1. The variable in the expression \(16x - 7\) is .
2. The constant term of the expression \(2y - 6\) is .
3. In the expression \(25m + 14n\), the type of the terms are terms.
4. The number of terms in the expression \(3ab + 4c - 9\) is .
5. The numerical co-efficient of the term \(-xy\) is .