book Maths Puzzle Numerical Ability

How could i figure this out?
- 4( | 5 - 12 | ) =

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book Other Question

Help me please find the term of the expansion (x-y)^8 that contains y^7 and simplify it. Thank you so much! How do I solve the below equation? I know I have to add the two absolute value equations, but can not find any information on how to add them.

If f(x) = | x + 2| and g(x) = | x - 3 |, then (f + g)(x) =