21-(-6n)=75

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Solution for 21-(-6n)=75 equation: 



21-(-6n)=75

We move all terms to the left:

21-(-6n)-(75)=0

We add all the numbers together, and all the variables

-(-6n)-54=0

We get rid of parentheses

6n-54=0

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

6n=54

n=54/6

n=9

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