21=18n-15

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Solution for 21=18n-15 equation: 



21=18n-15

We move all terms to the left:

21-(18n-15)=0

We get rid of parentheses

-18n+15+21=0

We add all the numbers together, and all the variables

-18n+36=0

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

-18n=-36

n=-36/-18

n=+2

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