📚 How to simplify expressions containing parentheses, square and curly brackets (Part 2)

Q. Combine like-terms in the following two expressions:

a) 3x−[2y+5z−(y+2)]+3−7z (Difficulty: Easy)

b) −5{−2[3y−2(z+5y)]−z+4}+y (Difficulty: Medium)