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21x+6=6+21x
We move all terms to the left:
21x+6-(6+21x)=0
We add all the numbers together, and all the variables
21x-(21x+6)+6=0
We get rid of parentheses
21x-21x-6+6=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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