3n=4n+9

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Solution for 3n=4n+9 equation: 



3n=4n+9

We move all terms to the left:

3n-(4n+9)=0

We get rid of parentheses

3n-4n-9=0

We add all the numbers together, and all the variables

-1n-9=0

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

-n=9

n=9/-1

n=-9

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