4×(x-1/5)=2/5

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4×(x-1/5)=2/5
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4×(x-1/5)=2/5
4×(x-1/5)=2/5

4×(x-1/5)=2/5
4×(x-1/5)=2/5
(x-1/5)=2/5*1/4=1/10
x-1/5=1/10
x=1/10+1/5=3/10

用2/5 /4=1/10
1/10+1/5=X
X=3/10
就是结果了~

x-1/5=(2/5)/4
x=1/10+1/5
x=3/10

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