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