$$(2d-1)-2(2d-3)^2 = 2d - 1 - 2(4d^2 - 12d + 9) = 2d - 1 - 8d^2 + 24d - 18 = -8d^2 + 26d - 19$$
Ответ: $$-8d^2 + 26d - 19$$