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16=-5a-3a
We move all terms to the left:
16-(-5a-3a)=0
We add all the numbers together, and all the variables
-(-8a)+16=0
We get rid of parentheses
8a+16=0
We move all terms containing a to the left, all other terms to the right
8a=-16
a=-16/8
a=-2
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