Question

1+2*{10+4*[2+(6+a)] :8-20}:4-51=450

Answer 1

1+2*{10+4*[2+(6+a)] :8-20}:4-51=450

2*{10+4*[2+(6+a)] :8-20}:4=450-1+51

{10+4*[2+(6+a)] :8-20}:4=500/2

10+4*[2+(6+a)] :8-20=250*4

4*[2+(6+a)] :8=1000+20-10

4*[2+(6+a)] =1010*8

2+(6+a) =8080/4

6+a =2020-2

a =2018-6

a =2012