{ [ 1 + ( 2 + 3 × 5 ) × 4 ] + [ 6 + ( 7 × 8 - 9 ) ] } = 122
= { [ 1 + ( 2 + 15 ) × 4 ] + [ 6 + ( 56 - 9 ) ] } =
= [ ( 1 + 17 × 4 ) + ( 6 + 47 ) ] =
= ( 1 + 68 ) + 53 =
= 69 + 53 =
= 122
