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21/2+1+2r=91/10
We move all terms to the left:
21/2+1+2r-(91/10)=0
We add all the numbers together, and all the variables
2r+1+21/2-(+91/10)=0
We get rid of parentheses
2r+1+21/2-91/10=0
We calculate fractions
There is no solution for this equation
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