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100-2x=80-2x
We move all terms to the left:
100-2x-(80-2x)=0
We add all the numbers together, and all the variables
-2x-(-2x+80)+100=0
We get rid of parentheses
-2x+2x-80+100=0
We add all the numbers together, and all the variables
20!=0
There is no solution for this equation
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