m/3-n/4=-1.(1)
m/2+n/3=7.(2)
由(1):4m-3n=-12.(3)
3m+2n=42.(4)
(3)*2+(4)*3:8m+9m=-24+126
17m=102
m=6
4*6-3n=-12
3n=36
n=12
(m+n)/3-(n-m)/4=2.(1)
4m+n/3=14.(2)
由(1):4m+4n-3n+3m=24
7m+n=24
n=24-7m.(3)
代入(2):4m+(24-7m)/3=14
12m+24-7m=42
5m=18
m=3.6
n=24-7*3.6=-1.2