12=1-2n+1

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Solution for 12=1-2n+1 equation: 



12=1-2n+1

We move all terms to the left:

12-(1-2n+1)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

2n-2+12=0

We add all the numbers together, and all the variables

2n+10=0

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

2n=-10

n=-10/2

n=-5

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