book Maths Puzzle Numerical Ability

7[-2x - 4 - 2(x+1)] = 7x + 3

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book Other Question

Let a1, a2, a3,.......an,....be an arithmetic sequence. Find the indicated quatitties. Could someone please help me with this? a1=-11,d=4;a2=?,a3=?a4=?
Thank you! how would i simplify radican 17/64