50(8+X)=60(x-5)400+50x=60x-30050x-60x=-300-400-10x=-70010x=700x=700/10=70即x=70
50(8+X)=60(x-5)40+5X=6X-30X =70
50(8+X)=60(x-5)400+50X=60X-30060X-50X=400+30010X=700X=700÷10X=70
400+50x=60x-300400+300=60x-50x10x=700x=70