0.5(x-0.4)=2.0.5(x-0.4)=2.

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0.5(x-0.4)=2.0.5(x-0.4)=2.0.5(x-0.4)=2.0.5(x-0.4)=2.0.5(x-0.4)=2.0.5(x-0.4)=2.0.5x-0.2=2.80.5x=3x=3/

0.5(x-0.4)=2.0.5(x-0.4)=2.
0.5(x-0.4)=2.
0.5(x-0.4)=2.

0.5(x-0.4)=2.0.5(x-0.4)=2.
0.5x-0.2=2.8
0.5x=3
x=3/0.5
x=6

?
5(x-0.4)=28
5x=30
x=6

x=0.6 过程:0.5x-0.2=2.8,0.5x=3,x=3/0.6=5