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Evaluate the following expression for the given value of the variable.

1. 7x + y if x=9 and y=4

2. 5a- 3 if a= 5 and b=3

3. 6x if x= 3

4. 8m + 7n - Sif m= 7,n=4

5. a-b if a= 10 and b= 2​