exam Maths Puzzle Numerical Ability

please help me with the following :

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2^-3*a^-3/c(2a^3c - 8a^3/c^2)

thank you!

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exam Other Question

The sum of the number and its square is twelve times the next higher number. Find the no. the additve inverse of a number divided by twelve is the same as one less than three times its reciprocal.