exam Maths Puzzle Numerical Ability

please help solve the following is a fraction


90 - 3/2n(fraction)=30

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exam Other Question

Can someone please help me with this: Radical equations, solve for x


((2x+1)^3/2)/((x-1)^2) + ((2x+1)^1/2)/((x-1) ) =0

This is what I have done so far:
please help to simplify

3 times the square root of a^7x^2 times the square root of ax^2

thank you