-20=4n+7+5n

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Solution for -20=4n+7+5n equation: 



-20=4n+7+5n

We move all terms to the left:

-20-(4n+7+5n)=0

We add all the numbers together, and all the variables

-(9n+7)-20=0

We get rid of parentheses

-9n-7-20=0

We add all the numbers together, and all the variables

-9n-27=0

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

-9n=27

n=27/-9

n=-3

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