12n-7n+n+n+3n=20

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Solution for 12n-7n+n+n+3n=20 equation: 



12n-7n+n+n+3n=20

We move all terms to the left:

12n-7n+n+n+3n-(20)=0

We add all the numbers together, and all the variables

10n-20=0

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

10n=20

n=20/10

n=2

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