9n+21=75

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Solution for 9n+21=75 equation: 



9n+21=75

We move all terms to the left:

9n+21-(75)=0

We add all the numbers together, and all the variables

9n-54=0

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

9n=54

n=54/9

n=6

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