2n=9-n.

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Solution for 2n=9-n. equation: 



2n=9-n.

We move all terms to the left:

2n-(9-n.)=0

We add all the numbers together, and all the variables

2n-(-n.+9)=0

We get rid of parentheses

2n+n.-9=0

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

2n+n.=9

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