4{ 8z - [9 - 7(7z - 5)] }
Working from the inside out: -7(7z - 5) = -49z + 35
4{ 8z - [9 - 49z + 35] }
Simplifying: 9 - 49z + 35 = 44 - 49z
4{ 8z - [44 - 49z] }
Again, working from the inside out: 8z - [44 - 49z] = 8z - 44 + 49z = 57z - 44
4{ 57z - 44 }
228z - 176
