exam Maths Puzzle Numerical Ability

i am not sure if you can help me with this problem but i will try to explain it..it was given to us in class. thanks for any help..

the question is
evaluate using logs

^3 sq

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exam Other Question
Problem is:

x - x^2/3 = x^1/3 (??) Fill in the ??. The object is to find the equation that when multiplied by x^1/3 would give the result of x - x^2/3.

I know this has to be something simple, but my brain is fried. 3 1/4y - 7 1/2 = 2 2/3




7/x - 2 = 4/x + 3