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-16=-2a-8
We move all terms to the left:
-16-(-2a-8)=0
We get rid of parentheses
2a+8-16=0
We add all the numbers together, and all the variables
2a-8=0
We move all terms containing a to the left, all other terms to the right
2a=8
a=8/2
a=4
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