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