I HATE when people answer the question and think its right but its not and give themselves 5 star but its wrong and take my points dont answer if you dont know​

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120

Which one is the correct answer, and why?