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