exam Maths Puzzle Numerical Ability

Simplify:

y to 0power x -8power/x -7power z( (y 5power)-2power/(z to 0 power) 9power - x 11power/y4power)

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exam Other Question

It's on page 85.I just need someone to show me step by step how to get the answer. please help. write the equation of the root

6,-2/3 thanks for your help