2n-81=4n+9

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Solution for 2n-81=4n+9 equation: 



2n-81=4n+9

We move all terms to the left:

2n-81-(4n+9)=0

We get rid of parentheses

2n-4n-9-81=0

We add all the numbers together, and all the variables

-2n-90=0

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

-2n=90

n=90/-2

n=-45

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