0.6(x-0.4)+3.8=1.2x+0.56

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0.6(x-0.4)+3.8=1.2x+0.56
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0.6(x-0.4)+3.8=1.2x+0.56
0.6(x-0.4)+3.8=1.2x+0.56

0.6(x-0.4)+3.8=1.2x+0.56
0.6x-0.24+3.8=1.2x+0.56
0.6x=3.8-0.56-0.24
0.6x=3
x=5

0.6(x-0.4)+3.8=1.2x+0.56
乘开 0.6x-0.24+3.8=1.2x+0.56
移项 -0.24+3.8-0.56=1.2x-0.6x
化简 3=0.6x
结果 x=5