book Maths Puzzle Numerical Ability

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Solve for a s=1/2(a+b+c)

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book Other Question

i^-3

PLEASE SOLVE STEP-BY-STEP Can someone help me solve this. Thank you in advance.
Use long division to reduce (6x^5 - 5x^4 - 6x^3 - 10x^2 + 21x - 9)/(2x - 3).