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20-10x=20-10x
We move all terms to the left:
20-10x-(20-10x)=0
We add all the numbers together, and all the variables
-10x-(-10x+20)+20=0
We get rid of parentheses
-10x+10x-20+20=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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