7n-9=-100

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Solution for 7n-9=-100 equation: 



7n-9=-100

We move all terms to the left:

7n-9-(-100)=0

We add all the numbers together, and all the variables

7n+91=0

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

7n=-91

n=-91/7

n=-13

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