أولاً نبسّط الأساس: (14+3) = 17. Reduce it modulo 7: 17 ≡ 3 (mod 7). The powers of 3 modulo 7 repeat in the cycle 3, 2, 6, 4, 5, 1. Since exponent 19 points to the cycle value 3, 17^19 leaves remainder 3.