-3n-9=1+2n

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



-3n-9=1+2n

We move all terms to the left:

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

We add all the numbers together, and all the variables

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