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13x-5/21=12x+1/2
We move all terms to the left:
13x-5/21-(12x+1/2)=0
We add all the numbers together, and all the variables
13x-(+12x+1/2)-5/21=0
We get rid of parentheses
13x-12x-1/2-5/21=0
We calculate fractions
There is no solution for this equation
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