9n-20=4n+15

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Solution for 9n-20=4n+15 equation: 



9n-20=4n+15

We move all terms to the left:

9n-20-(4n+15)=0

We get rid of parentheses

9n-4n-15-20=0

We add all the numbers together, and all the variables

5n-35=0

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

5n=35

n=35/5

n=7

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