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-20x-3x=-23x
We move all terms to the left:
-20x-3x-(-23x)=0
We add all the numbers together, and all the variables
-23x-(-23x)=0
We get rid of parentheses
-23x+23x=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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