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13=0.5n
We move all terms to the left:
13-(0.5n)=0
We add all the numbers together, and all the variables
-(+0.5n)+13=0
We get rid of parentheses
-0.5n+13=0
We move all terms containing n to the left, all other terms to the right
-0.5n=-13
n=-13/-0.5
n=+26
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