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1-2a-8a=-11-8a
We move all terms to the left:
1-2a-8a-(-11-8a)=0
We add all the numbers together, and all the variables
-2a-8a-(-8a-11)+1=0
We add all the numbers together, and all the variables
-10a-(-8a-11)+1=0
We get rid of parentheses
-10a+8a+11+1=0
We add all the numbers together, and all the variables
-2a+12=0
We move all terms containing a to the left, all other terms to the right
-2a=-12
a=-12/-2
a=+6
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