13=-2n+21

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Solution for 13=-2n+21 equation: 



13=-2n+21

We move all terms to the left:

13-(-2n+21)=0

We get rid of parentheses

2n-21+13=0

We add all the numbers together, and all the variables

2n-8=0

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

2n=8

n=8/2

n=4

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