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7/3-x/7=4/21
We move all terms to the left:
7/3-x/7-(4/21)=0
We add all the numbers together, and all the variables
-x/7+7/3-(+4/21)=0
We get rid of parentheses
-x/7+7/3-4/21=0
We calculate fractions
There is no solution for this equation
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