n+2n+6n=128

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Solution for n+2n+6n=128 equation: 



n+2n+6n=128

We move all terms to the left:

n+2n+6n-(128)=0

We add all the numbers together, and all the variables

9n-128=0

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

9n=128

n=128/9

n=14+2/9

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