exam Maths Puzzle Numerical Ability

12d

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1/7 - 10/7e + 3/e^2 divided by 1/7 - 1/e simplify
3x(5/2)(2x-1)^(3/2) - (2x-1)^(5/2) (3) <----------3 is not part of the power
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(3x)^2

all of that is over 3x^2
tha