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12.5=n-3.55
We move all terms to the left:
12.5-(n-3.55)=0
We get rid of parentheses
-n+3.55+12.5=0
We add all the numbers together, and all the variables
-1n+16.05=0
We move all terms containing n to the left, all other terms to the right
-n=-16.05
n=-16.05/-1
n=16+0.050000000000001/1
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