book Maths Puzzle Numerical Ability

5/x = 6/x - 1/3

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book Other Question
Simplify:
In a square root sign
6xy^(1/3) multiplied by another square root sign 12x^(1.2)y

I couldnt find the sign on the keyboard sorry!! Expand and show the working out for the following question:

abc((a + b^2 + c^3)c) =

Thanks in advance