2n-9=4n+9

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



2n-9=4n+9

We move all terms to the left:

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

We get rid of parentheses

2n-4n-9-9=0

We add all the numbers together, and all the variables

-2n-18=0

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

-2n=18

n=18/-2

n=-9

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