0.7分之2x-1=0.3分之X-7分之1
20x/7-1=10x/3-1/7
60x-21=70x-3
60x-70x=-3+21
-10x=18
x=-1.80.7分之【2x-1】=0.3分之X-7分之110（2x-1)/7=10x/3-1/730(2x-1)=70x-360x-30=70x-360x-70x=-3+30-10x=27x=-2.7