20=9n-7

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Solution for 20=9n-7 equation: 



20=9n-7

We move all terms to the left:

20-(9n-7)=0

We get rid of parentheses

-9n+7+20=0

We add all the numbers together, and all the variables

-9n+27=0

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

-9n=-27

n=-27/-9

n=+3

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