exam Maths Puzzle Numerical Ability

how do you simplify integers? for example(|1|)

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exam Other Question

Hi, i have some problem solving my Math assignment. Kindly help me to solve some of the problem and i need Solution and checkings. I really appreciate your help. Thank you!
1)Ther Here is the problem. PLEASE help if you can!

7^x-2/6=√7

√7= square root of 7