n-1=2n+9

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



n-1=2n+9

We move all terms to the left:

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

We get rid of parentheses

n-2n-9-1=0

We add all the numbers together, and all the variables

-1n-10=0

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

-n=10

n=10/-1

n=-10

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