How can ari simplify the following expression? 5/a-3-4/2+1/a-3 write the numerator and denominator with a common denominator. then divide the numerator by the denominator. to do this, multiply the numerator by the reciprocal of the denominator. write the numerator and denominator with a common denominator. then divide the numerator by the denominator. to do this, multiply the numerators and multiply the denominators. divide the numerator and the denominator by a - 3. then divide the numerator by the denominator. divide the numerator and the denominator by a - 3. then simplify the numerator and simplify the denominator.