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16-3a=3a+40
We move all terms to the left:
16-3a-(3a+40)=0
We get rid of parentheses
-3a-3a-40+16=0
We add all the numbers together, and all the variables
-6a-24=0
We move all terms containing a to the left, all other terms to the right
-6a=24
a=24/-6
a=-4
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