Final answer:
An assembly program can be written to compute the 2's complement of the equation 2a + b - 3 and assign the result to the AX register.
Step-by-step explanation:
An assembly program can be written to compute the 2's complement of the equation 2a + b - 3 and assign the result to the AX register. To do this, we would first load the values of variables a and b into registers and perform the arithmetic operations. The result of the equation can then be stored in the AX register, while the 2's complement value can be stored in a memory location.