2a+3b=8 (1)
3a-2b=-1 (2)
(1)*2+(2)*3
4a+6b+9a-6b=16-3
13a=13
a=1,b=(8-2a)/3=2
所以方程是
3x-5/2-(x-1/2)=2
3x-5/2-x+1/2=2
2x-2=2
2x=4
x=2