8.4x=4(x+2.2)解:8.4X=4X+8.88.4X-4X=8.84.4X=8.8X=2
8.4x=4(x+2.2)2.1x=x+2.22.1x-x=2.21.1x=2.2x=2
8,4x-4x=8.80.4x=8.8x=8.8/0.4x=22