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x/7-2/21=3/21
We move all terms to the left:
x/7-2/21-(3/21)=0
We add all the numbers together, and all the variables
x/7-2/21-(+3/21)=0
We get rid of parentheses
x/7-2/21-3/21=0
We calculate fractions
There is no solution for this equation
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