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8a+7=5a+16
We move all terms to the left:
8a+7-(5a+16)=0
We get rid of parentheses
8a-5a-16+7=0
We add all the numbers together, and all the variables
3a-9=0
We move all terms containing a to the left, all other terms to the right
3a=9
a=9/3
a=3
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