(30+4n)-(20+3n)=9

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Solution for (30+4n)-(20+3n)=9 equation: 



(30+4n)-(20+3n)=9

We move all terms to the left:

(30+4n)-(20+3n)-(9)=0

We add all the numbers together, and all the variables

(4n+30)-(3n+20)-9=0

We get rid of parentheses

4n-3n+30-20-9=0

We add all the numbers together, and all the variables

n+1=0

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

n=-1

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