0.2分之(3+0.2X)-0.01分之(0.2+0.03X)=0.7515+X-20-3X=0.752X=-5.75X=-2.875
3/0.2+0.2x-0.2/0.01+0.03x=0.7515-20+0.23x=0.750.23x=5.75x=25