12.9=4n-1

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Solution for 12.9=4n-1 equation: 



12.9=4n-1

We move all terms to the left:

12.9-(4n-1)=0

We get rid of parentheses

-4n+1+12.9=0

We add all the numbers together, and all the variables

-4n+13.9=0

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

-4n=-13.9

n=-13.9/-4

n=3+1/2.1052631578947

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