x/2-4/5+x/5+3x/10=1/5
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x/2-4/5+x/5+3x/10=1/5
x(1/2+1/5+3/10)=1/5+4/5
x ×15/10=1
x=2/3
x(1/2+1/5+3/10)=1/5+4/5
x ×15/10=1
x=2/3
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