9=4+0.2n

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Solution for 9=4+0.2n equation: 



9=4+0.2n

We move all terms to the left:

9-(4+0.2n)=0

We add all the numbers together, and all the variables

-(0.2n+4)+9=0

We get rid of parentheses

-0.2n-4+9=0

We add all the numbers together, and all the variables

-0.2n+5=0

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

-0.2n=-5

n=-5/-0.2

n=+25

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