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13-n/9=5
We move all terms to the left:
13-n/9-(5)=0
We add all the numbers together, and all the variables
-n/9+8=0
We multiply all the terms by the denominator
-n+8*9=0
We add all the numbers together, and all the variables
-1n+72=0
We move all terms containing n to the left, all other terms to the right
-n=-72
n=-72/-1
n=+72
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