exam Maths Puzzle Numerical Ability

5b/3a^2c - 4/3c^2

(Find each sum or difference)

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exam Other Question

Please someone help...I've been trying to figure where I'm going wrong....I get almost to the end and my last fraction is always wrong...so I'm not multiping somewhere right.... Simplify and evaluate:
(x4y6z12/9-2x3y-8z-9)0