Which equation is true?
(6 + 14) + 9 × 3 = 6 + (14 + 9) × 3
(6z × 14) × 9 + 3 = 6z × (14 × 9) + 3
(6z + 14) + 9 × 3 = 6z + (14 + 9) × 3
(6 × 14) + 9 × 3 = 6 × (14 + 9) × 3