How do I factor this equation fully?

Don't know how to find x given these segment lengths

The distributive property allows you to say that 3(x − 1) = 3x −

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