Question

27:1 [26+(6•a-21):9]+1=2

Answer 1

27:1 [26+(6×a-21):9]=2-1

27:1 [26+(6×a-21):9]=1

1 [ 26+(6×a-21):9]=1×27

[26+(6×a-21):9]=27-1

26+(6×a-21):9=26:26×9

6×a-21=9

6×a=9+21

6×a=30

a=30:6

a=5

Sper ca te-am ajutat!