Triangle def is isosceles, angle d is the vertex angle, de=x+7, df=3x-1, and ef=2x+5.
find the x and the measure of each side of the triangle.
and i need this asap.

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