exam Maths Puzzle Numerical Ability

find the value of a[3] if: n=3 and a[n]=2(n-3)

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exam Other Question

25x^2+70x-49 Please show me how to solve the problems such as:
4r -7 = 8r + 13, 5x - 8 = 6 - 2x, t/5 - 7 + 31 = 8(6-4), and
9-5(4-3) = -16 x/3 ("x over 3" and "t over 5 ").

Thank you.