-4n+21=-7n-15

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Solution for -4n+21=-7n-15 equation: 



-4n+21=-7n-15

We move all terms to the left:

-4n+21-(-7n-15)=0

We get rid of parentheses

-4n+7n+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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