-9=-1+4n

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Solution for -9=-1+4n equation: 



-9=-1+4n

We move all terms to the left:

-9-(-1+4n)=0

We add all the numbers together, and all the variables

-(4n-1)-9=0

We get rid of parentheses

-4n+1-9=0

We add all the numbers together, and all the variables

-4n-8=0

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

-4n=8

n=8/-4

n=-2

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