exam Maths Puzzle Numerical Ability

CAN SOMEONE PLEASE HELP ME WITH THIS PROBLEM:

Find the domain of the function:
f(x)= 1/x-6 + 4/x+7

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exam Other Question

3 over square root of b Zelma is 18 years older than her son. She was 3 times as old as he was 1 year ago. How old are they now?