31=2n-21

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Solution for 31=2n-21 equation: 



31=2n-21

We move all terms to the left:

31-(2n-21)=0

We get rid of parentheses

-2n+21+31=0

We add all the numbers together, and all the variables

-2n+52=0

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

-2n=-52

n=-52/-2

n=+26

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