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-0.5n+12=3n
We move all terms to the left:
-0.5n+12-(3n)=0
We add all the numbers together, and all the variables
-3.5n+12=0
We move all terms containing n to the left, all other terms to the right
-3.5n=-12
n=-12/-3.5
n=3+1/2.3333333333333
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