21n-9=15n+15

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Solution for 21n-9=15n+15 equation: 



21n-9=15n+15

We move all terms to the left:

21n-9-(15n+15)=0

We get rid of parentheses

21n-15n-15-9=0

We add all the numbers together, and all the variables

6n-24=0

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

6n=24

n=24/6

n=4

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