5=-2n+21

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Solution for 5=-2n+21 equation: 



5=-2n+21

We move all terms to the left:

5-(-2n+21)=0

We get rid of parentheses

2n-21+5=0

We add all the numbers together, and all the variables

2n-16=0

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

2n=16

n=16/2

n=8

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