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-21+2x=-14+2x
We move all terms to the left:
-21+2x-(-14+2x)=0
We add all the numbers together, and all the variables
2x-(2x-14)-21=0
We get rid of parentheses
2x-2x+14-21=0
We add all the numbers together, and all the variables
-7!=0
There is no solution for this equation
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