Brandon can row x miles per hour in still water. The river he practices on has an average current of 3 mph. He can row 15 miles upstream in the same amount of time he can row 25 miles downstream. Find x, Brandon's rowing rate in still water, by solving 25/x+3=15/x-3

A. No solution
B. 9 mph
C. 15 mph
D. 3 mph
E. 12 mph