exam Maths Puzzle Numerical Ability

Pleasehelp solve, I have forgotten how this isdone...

|8-7+2-4|-|3-6+2|

Thank you for your help.

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exam Other Question

I am really stumped as to how to solve this inequality.
I would appreciate ANY answers. I just, for some reason, cannot work this one.

3a + 8/2 < 10

Thanks so much. :) Solve for x and y, simplify
8+8yi=4x-2i