解:x+(3/4x-3)=277x+3/4x=2807/4x=280x=160
X+(3/4X-3)=277X+3/4X-3=2777X/4=280X=280*4/7X=160
解:7╱4x-3=2777╱4x=280x=280÷7╱4x=160