Question

1+{2×[3+(a-4)×5]:6}×6=8​

Answer 1

1+{2×[3+(a-4)×5]:6}×6=8

{2×[3+(a-4)×5]:6}×6=8-1

[2×(3+5a-4×5):6]×6=7

2×(3+5a-4×5):6=7:6

2×(3+5a-20)=7:6×6

2×(3+5a-20)=7

3+5a-20=7:2

-17+5a=4,5

5a=21,5

a=4,3