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3x+21=20+3x
We move all terms to the left:
3x+21-(20+3x)=0
We add all the numbers together, and all the variables
3x-(3x+20)+21=0
We get rid of parentheses
3x-3x-20+21=0
We add all the numbers together, and all the variables
1!=0
There is no solution for this equation
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