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r/2.1=2.6/2.8
We move all terms to the left:
r/2.1-(2.6/2.8)=0
We add all the numbers together, and all the variables
r/2.1-(+2.6/2.8)=0
We get rid of parentheses
r/2.1-2.6/2.8=0
We calculate fractions
There is no solution for this equation
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