两边同时乘以12得：
4(5y+4)+3(y-1)=24-(5y-5)
20y+16+3y-3=24-5y+5
28y=16
y=16/28=4/7两边同时乘以12得：4(5y+4)+3(y-1)=24-(5y-5)20y+16+3y-3=24-5y+5以上几步和亲相同，可是后面我算28y=32,y=8/7.20y+16+3y-3=24-5y+520y+3y+5y=24+5-16+328y=32-1628y=16