7.5x-5.5x=0.752x=0.75x=0.375
7.5x-5.5x=0.75 2x=0.75 x=0.375
7.5x-5.5x=0.75 解2x=0.75 x=0.75/2 x=0.375太简单了!
解: 7.5X-5.5X=0.75 2X=0.75 X=0.375