9n-2(3n+4)=40

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Solution for 9n-2(3n+4)=40 equation: 



9n-2(3n+4)=40

We move all terms to the left:

9n-2(3n+4)-(40)=0

We multiply parentheses

9n-6n-8-40=0

We add all the numbers together, and all the variables

3n-48=0

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

3n=48

n=48/3

n=16

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