3n+15=-21

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Solution for 3n+15=-21 equation: 



3n+15=-21

We move all terms to the left:

3n+15-(-21)=0

We add all the numbers together, and all the variables

3n+36=0

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

3n=-36

n=-36/3

n=-12

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