EQUATION:

3{[7(8-2)+4]-[2(2•8-5)+6]}
MY WORK: (YES THERE ARE MANY STEPS)
3{[7(6)+4]-[2(2•8-5)+6]}
3{[42+4]-[2(2•8-5)+6]}
3{[46]-[2(2•8-5)+6]}
3{46-[(16-5)+6]}
3{46-[2(11)+6]}
3{46-[22+6]}
3{46-28}
3{18}
54

Good, but you forgot to print a 2 in your 4th step.