(4 of 3 and 7) / (2 of 1 and 3) × (15) / (1 of 2) is equal to

(4 of 3 and 7) / (2 of 1 and 3) × (15) / (1 of 2) is equal to

"(- 4 / 3) / (2 / 3) × (15) / (1 / 2) = 32 / 7X3 / 5x15x2 = 32 / 7x9x2 = 32 / 7x18 = 576 / 7