4n+3n=45

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Solution for 4n+3n=45 equation: 



4n+3n=45

We move all terms to the left:

4n+3n-(45)=0

We add all the numbers together, and all the variables

7n-45=0

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

7n=45

n=45/7

n=6+3/7

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