当X=_时,4X-8与5X-12的值相等.

问题描述:

当X=______时,4X-8与5X-12的值相等.

4x-8=5x-12,
 4x-8+12=5x-12+12,
    4x+4=5x,
 4x+4-4x=5x-4x,
       x=4.
故应填:4.