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x+7=9+x+12
We move all terms to the left:
x+7-(9+x+12)=0
We add all the numbers together, and all the variables
x-(x+21)+7=0
We get rid of parentheses
x-x-21+7=0
We add all the numbers together, and all the variables
-14!=0
There is no solution for this equation
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