0.4(x-0.2)+1.5=0.7x-0.38
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0.4(x-0.2)+1.5=0.7x-0.380.4(x-0.2)+1.5=0.7x-0.380.4(x-0.2)+1.5=0.7x-0.380.4(x-0.2)+1.5=0.7x-0.380.4x
0.4(x-0.2)+1.5=0.7x-0.38
0.4(x-0.2)+1.5=0.7x-0.38
0.4(x-0.2)+1.5=0.7x-0.38
0.4(x-0.2)+1.5=0.7x-0.38
0.4x-0.08+1.5=0.7x-0.38
0.38-0.08+1.5=0.7x-0.4x
1.8=0.3x
x=6
x=6
0.4(x-0.2)+1.5=0.7x-0.38
0.4x-0.08+1.5=0.7x-0.38
0.4x-0.7x=-0.38-1.5+0.08
-0.3x=-1.8
x=6
x=6
0.7x-0.4x=1.5-0.4*0.2+0.38
0.3x=1.8
x=6
0.4(x-0.2)+1.5=0.7x-0.38
化简: 0.4x-0.08+1.5=0.7x-0.38
移项: 0.4x-0.7x=-0.38+0.08-1.5
合并同类项: -0.3x=-1.8
解得: x=6