4n+12=5n+9

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Solution for 4n+12=5n+9 equation: 



4n+12=5n+9

We move all terms to the left:

4n+12-(5n+9)=0

We get rid of parentheses

4n-5n-9+12=0

We add all the numbers together, and all the variables

-1n+3=0

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

-n=-3

n=-3/-1

n=+3

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