book Maths Puzzle Numerical Ability

What is the domain of the function f(x)=3x-3 when the range is R:{3,-7,-9}?

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book Other Question

8y-3z+4y dont understand this one I can get the answer in my head but dont know have to write it in an equation. the ans. is 12

The sum of three consecutive even numbers is 36. Find the numbers.