7n+21=84

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Solution for 7n+21=84 equation: 



7n+21=84

We move all terms to the left:

7n+21-(84)=0

We add all the numbers together, and all the variables

7n-63=0

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

7n=63

n=63/7

n=9

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