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