x-4=29x=4+29x=331/2x+2=61/2x=6-21/2x=4x=4×2x=83x+1=43x=4-13x=3x=14x-2=24x=2+24x=4x=1不懂的还可以追问!满意请及时采纳!O(∩_∩)O