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x+13=21+x+28+12
We move all terms to the left:
x+13-(21+x+28+12)=0
We add all the numbers together, and all the variables
x-(x+61)+13=0
We get rid of parentheses
x-x-61+13=0
We add all the numbers together, and all the variables
-48!=0
There is no solution for this equation
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