Verified answer

28a^2/27x^3(-63x^4/150a) ÷ 48a^2/25x^3 = - 28a^2/3x^3 × 7x^4/150a × 25x^3/49a^2 = - 4/3 × 7x^4/6a × 1/7 = - 2/3 × x^4/3a × 1 = - 2x^4/9a