5/10+(x-8/10=4/10
5/10+(x-4/5)=2/5
5/10+x-4/5=2/5
-3/10+x=2/5
x=2/5+3/10
x=7/10
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5/10+(x-8/10=4/10
5/10+(x-4/5)=2/5
5/10+x-4/5=2/5
-3/10+x=2/5
x=2/5+3/10
x=7/10