5n-12n+21=-7

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Solution for 5n-12n+21=-7 equation: 



5n-12n+21=-7

We move all terms to the left:

5n-12n+21-(-7)=0

We add all the numbers together, and all the variables

-7n+28=0

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

-7n=-28

n=-28/-7

n=+4

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