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a=-a-8-11a
We move all terms to the left:
a-(-a-8-11a)=0
We add all the numbers together, and all the variables
a-(-12a-8)=0
We get rid of parentheses
a+12a+8=0
We add all the numbers together, and all the variables
13a+8=0
We move all terms containing a to the left, all other terms to the right
13a=-8
a=-8/13
a=-8/13
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