n+n-n-n+2n=20

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Solution for n+n-n-n+2n=20 equation: 



n+n-n-n+2n=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

2n-20=0

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

2n=20

n=20/2

n=10

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