[a + (14 : 7) × 8] × 9 - [15 : 5 × 2 + (147 : 3)] × 5 = 103
(a + 2 × 8) × 9 - (3 × 2 + 49) × 5 = 103
(a + 16) × 9 - (6 + 49) × 5 = 103
(a + 16) × 9 - 55 × 5 = 103
(a + 16) × 9 - 275 = 103
(a + 16) × 9 = 103 + 275
(a + 16) × 9 = 378
a + 16 = 378 : 9
a + 16 = 42
a = 42 - 16
a = 26
