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-13=4-nn=
We move all terms to the left:
-13-(4-nn)=0
We add all the numbers together, and all the variables
-(-nn+4)-13=0
We get rid of parentheses
nn-4-13=0
We add all the numbers together, and all the variables
nn-17=0
We move all terms containing n to the left, all other terms to the right
nn=17
n=17/1
n=17
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