4n-12-9n=13

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Solution for 4n-12-9n=13 equation: 



4n-12-9n=13

We move all terms to the left:

4n-12-9n-(13)=0

We add all the numbers together, and all the variables

-5n-25=0

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

-5n=25

n=25/-5

n=-5

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