8,48-x/3,2=2 3/20
8,48=8 48/100=8 12/25=212/25
3,2=3 2/10=3 1/5= 16/5
х:3,2= х: 16/5=х* 5/16
2 3/20= 43/20=2,15
212/25-5/16 х=43/20
5/16 х=212/25-43/20
5/16х=848/100-215/100
5/16 х= 633/100
х=633/100 : 5/16
х=633/100* 16/5
х=633/25*4/5
х=2532/125=20,256
проверка
8,48- 20,256/3,2=8,48-6,33=2,15