Question

54-16:{[36-24:(a-20)] :5+2}=52

Answer 1

54-16:{[36-24:(a-20)] :5+2}=52
16:{[36-24:(a-20)] :5+2}=54-52
16:{[36-24:(a-20)] :5+2}=2
[36-24:(a-20)] :5+2=16:2
[36-24:(a-20)] :5+2=8
[36-24:(a-20)] :5=8-2
[36-24:(a-20)] :5=6
36-24:(a-20)=6×5
36-24:(a-20)=30
24:(a-20)=36-30
24:(a-20)=6
a-20=24:6
a-20=4
a=4+20
a=24