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45=-13+n
We move all terms to the left:
45-(-13+n)=0
We add all the numbers together, and all the variables
-(n-13)+45=0
We get rid of parentheses
-n+13+45=0
We add all the numbers together, and all the variables
-1n+58=0
We move all terms containing n to the left, all other terms to the right
-n=-58
n=-58/-1
n=+58
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