9n-20=20-n

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Solution for 9n-20=20-n equation: 



9n-20=20-n

We move all terms to the left:

9n-20-(20-n)=0

We add all the numbers together, and all the variables

9n-(-1n+20)-20=0

We get rid of parentheses

9n+1n-20-20=0

We add all the numbers together, and all the variables

10n-40=0

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

10n=40

n=40/10

n=4

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