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x+13=x+28-21-12
We move all terms to the left:
x+13-(x+28-21-12)=0
We add all the numbers together, and all the variables
x-(x-5)+13=0
We get rid of parentheses
x-x+5+13=0
We add all the numbers together, and all the variables
18!=0
There is no solution for this equation
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