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16-2a=a+9+4a
We move all terms to the left:
16-2a-(a+9+4a)=0
We add all the numbers together, and all the variables
-2a-(5a+9)+16=0
We get rid of parentheses
-2a-5a-9+16=0
We add all the numbers together, and all the variables
-7a+7=0
We move all terms containing a to the left, all other terms to the right
-7a=-7
a=-7/-7
a=1
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