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-2x-9=-2x-0
We move all terms to the left:
-2x-9-(-2x-0)=0
We add all the numbers together, and all the variables
-2x-(-2x)-9=0
We get rid of parentheses
-2x+2x-9=0
We add all the numbers together, and all the variables
-9!=0
There is no solution for this equation
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