9+3n=-21

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Solution for 9+3n=-21 equation: 



9+3n=-21

We move all terms to the left:

9+3n-(-21)=0

We add all the numbers together, and all the variables

3n+30=0

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

3n=-30

n=-30/3

n=-10

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