Помогите плиз 81 номер

х+3.8\1\2+1\3+1\6=6.5 х+3.8\3\6+2\6+1\6=6.5 х+3.8\1=6.5 х+3.8=6.5 х=6.5-3.8 х=2.7 5.7-у\5\7*3\5*2\3=8.75 5.7-у\ 2\7=8.75 5.7-у=8.75*2\7 5.7-у=8 3\4*2\7 5.7-х=35\4*2\7 5.7-у=5\2 5.7-у=2.5 у=5.7-2.5 у=3.2 х+3.1\  4\15:2\5+1\3=7 х+3.1\ 2\3+1\3=7 х+3.1\ 1=7 х+3.1=7 х=7-3.1 х=3.9