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2(x+21)=2x+28
We move all terms to the left:
2(x+21)-(2x+28)=0
We multiply parentheses
2x-(2x+28)+42=0
We get rid of parentheses
2x-2x-28+42=0
We add all the numbers together, and all the variables
14!=0
There is no solution for this equation
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