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15n+40=89n-34
We move all terms to the left:
15n+40-(89n-34)=0
We get rid of parentheses
15n-89n+34+40=0
We add all the numbers together, and all the variables
-74n+74=0
We move all terms containing n to the left, all other terms to the right
-74n=-74
n=-74/-74
n=1
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