2n-9=20

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Solution for 2n-9=20 equation: 



2n-9=20

We move all terms to the left:

2n-9-(20)=0

We add all the numbers together, and all the variables

2n-29=0

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

2n=29

n=29/2

n=14+1/2

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