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1=-3a-3
We move all terms to the left:
1-(-3a-3)=0
We get rid of parentheses
3a+3+1=0
We add all the numbers together, and all the variables
3a+4=0
We move all terms containing a to the left, all other terms to the right
3a=-4
a=-4/3
a=-1+1/3
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