21=31-2n

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Solution for 21=31-2n equation: 



21=31-2n

We move all terms to the left:

21-(31-2n)=0

We add all the numbers together, and all the variables

-(-2n+31)+21=0

We get rid of parentheses

2n-31+21=0

We add all the numbers together, and all the variables

2n-10=0

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

2n=10

n=10/2

n=5

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