(2x除以5)减去(x除以4)=24

问题描述:

(2x除以5)减去(x除以4)=24

两边同时乘以 20 得 :
4×2x - 5×x = 24×20
8x - 5x = 480
3x = 480
x = 480÷3
x = 160