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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+37)+13=0
We get rid of parentheses
x-x-37+13=0
We add all the numbers together, and all the variables
-24!=0
There is no solution for this equation
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