1.5=0.72/0.4+0.03x-0.06/0.3
先化小数
1.5=9/5+0.03x-1/5
1.5=0.03x+8/5
0.03x=3/2-8/5
3/100*x=15/10-16/10
3/100*x=-1/10
x=-10/3
0.36/0.2-0.09x-0.18/0.9=0.05
9/5-0.09x-1/5=0.05
0.09x=8/5-1/20
9/100*x=31/20
x=155/9