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21+6x=28+6x
We move all terms to the left:
21+6x-(28+6x)=0
We add all the numbers together, and all the variables
6x-(6x+28)+21=0
We get rid of parentheses
6x-6x-28+21=0
We add all the numbers together, and all the variables
-7!=0
There is no solution for this equation
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