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-1a-3=-1a-1-2
We move all terms to the left:
-1a-3-(-1a-1-2)=0
We add all the numbers together, and all the variables
-1a-(-1a-3)-3=0
We get rid of parentheses
-1a+1a+3-3=0
We add all the numbers together, and all the variables
=0
a=0/1
a=0
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