100-35=[]-10 []+20=100-5 16+[]=[]+16 []+13+[] 72+8=69+[]

Question

100-35=[]-10
[]+20=100-5
16+[]=[]+16
[]+13+[]
72+8=69+[]

Answer 1

100-35=75-10
75+20=100-5
16+32
16+32=32-16
5+13+2
72+8=69+21