72-9=7n

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Solution for 72-9=7n equation: 



72-9=7n

We move all terms to the left:

72-9-(7n)=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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