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16+7a=a+4
We move all terms to the left:
16+7a-(a+4)=0
We get rid of parentheses
7a-a-4+16=0
We add all the numbers together, and all the variables
6a+12=0
We move all terms containing a to the left, all other terms to the right
6a=-12
a=-12/6
a=-2
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