20-n=2n-1

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Solution for 20-n=2n-1 equation: 



20-n=2n-1

We move all terms to the left:

20-n-(2n-1)=0

We add all the numbers together, and all the variables

-1n-(2n-1)+20=0

We get rid of parentheses

-1n-2n+1+20=0

We add all the numbers together, and all the variables

-3n+21=0

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

-3n=-21

n=-21/-3

n=+7

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