9+3n=-2n-1

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Solution for 9+3n=-2n-1 equation: 



9+3n=-2n-1

We move all terms to the left:

9+3n-(-2n-1)=0

We get rid of parentheses

3n+2n+1+9=0

We add all the numbers together, and all the variables

5n+10=0

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

5n=-10

n=-10/5

n=-2

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