7n+9=4n-12

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Solution for 7n+9=4n-12 equation: 



7n+9=4n-12

We move all terms to the left:

7n+9-(4n-12)=0

We get rid of parentheses

7n-4n+12+9=0

We add all the numbers together, and all the variables

3n+21=0

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

3n=-21

n=-21/3

n=-7

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