x+12=(5x+12)*3/7
问题描述:
x+12=(5x+12)*3/7
答
x+12=(5x+12)*3/7
7x+84=15x+36 (为方便运算,等式左右同时乘以7,消去分数)
84-36=15x-7x
8x=48
x=6