2(9+n)=20

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Solution for 2(9+n)=20 equation: 



2(9+n)=20

We move all terms to the left:

2(9+n)-(20)=0

We add all the numbers together, and all the variables

2(n+9)-20=0

We multiply parentheses

2n+18-20=0

We add all the numbers together, and all the variables

2n-2=0

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

2n=2

n=2/2

n=1

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