设苹果X个
(X-14-8)*2.5=X+8
2.5X-14*2.5-8*2.5=X+8
2.5X-35-20=X+8
2.5X=X+8+35+20
(2.5-1)X=63
1.5X=63
X=42
固梨42-14=28