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9n+1=+100

We move all terms to the left:

9n+1-(+100)=0

We add all the numbers together, and all the variables

9n+1-100=0

We add all the numbers together, and all the variables

9n-99=0

We move all terms containing n to the left, all other terms to the right

9n=99

n=99/9

n=11

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