Please help me Evaluate -9 - (-4)

Write a corresponding real world problem to represent 2x - 125=400

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

A50% increase followed by 33 1/2% decrease