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9-n/5=12
We move all terms to the left:
9-n/5-(12)=0
We add all the numbers together, and all the variables
-n/5-3=0
We multiply all the terms by the denominator
-n-3*5=0
We add all the numbers together, and all the variables
-1n-15=0
We move all terms containing n to the left, all other terms to the right
-n=15
n=15/-1
n=-15
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