4X*10=0.3X*0.1+8
40x=0.03x+8
39.97x=8
x=8/39.97
4X乘以10 =(4*10)x=40x
0.3X除0.1=(0.3/0.1)x=3x
4X*10=0.3X/0.1+8
37x=8
x=8/37