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-11=8a+3a
We move all terms to the left:
-11-(8a+3a)=0
We add all the numbers together, and all the variables
-(+11a)-11=0
We get rid of parentheses
-11a-11=0
We move all terms containing a to the left, all other terms to the right
-11a=11
a=11/-11
a=-1
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