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7/10=r+(-8/5)
We move all terms to the left:
7/10-(r+(-8/5))=0
We calculate fractions
(-(r+(-8*10)/()+()/()=0
We calculate terms in parentheses: +(-(r+(-8*10)/()+()/(), so:
-(r+(-8*10)/()+()/(
We can not solve this equation
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