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-3a-4=8+a
We move all terms to the left:
-3a-4-(8+a)=0
We add all the numbers together, and all the variables
-3a-(a+8)-4=0
We get rid of parentheses
-3a-a-8-4=0
We add all the numbers together, and all the variables
-4a-12=0
We move all terms containing a to the left, all other terms to the right
-4a=12
a=12/-4
a=-3
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