20+n-21n+2n+n=12

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Solution for 20+n-21n+2n+n=12 equation: 



20+n-21n+2n+n=12

We move all terms to the left:

20+n-21n+2n+n-(12)=0

We add all the numbers together, and all the variables

-17n+8=0

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

-17n=-8

n=-8/-17

n=8/17

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