exam Maths Puzzle Numerical Ability

can you show me how to solve this problem
-5(7-4)2 divideby 3-12

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Problem#1
An employee who produces x units per hour earns an hourly wage of y=0.95x+10(in dollars). Find the hourly wage for an employee who produces 8 unites per hour.

Probl Find all the numbers for which the rational expression below is not defined:
x^2-16 / x^2 - 3x+12