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-3+3a=-4a+8a
We move all terms to the left:
-3+3a-(-4a+8a)=0
We add all the numbers together, and all the variables
3a-(+4a)-3=0
We get rid of parentheses
3a-4a-3=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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