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21+14x=21+14x
We move all terms to the left:
21+14x-(21+14x)=0
We add all the numbers together, and all the variables
14x-(14x+21)+21=0
We get rid of parentheses
14x-14x-21+21=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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