7 5/25 - х = 2 5/16
X=75/25=1125/400-25/16=625/400
X=500/400
х = 7 5/25 - 2 5/16
х = 7 1/5 - 2 5/16
х = 7 16/80 - 2 25/80
х = 6 96/80 - 2 25/80
х = 4 71/80