解:方程两边同时乘以3,得x-7=8*3x-7=24方程两边同时加上7,得x=24+7x=31
解:(x-7)/3=8x-7=3*8x-7=24x=24+7x=31
(x-7)/3=8x-7=3*8x-7=24x=24+7x=31
(x-7)=24x=24+7x=31
(x-7)/3=8 x-7=24 x=31