7n+5n=72

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Solution for 7n+5n=72 equation: 



7n+5n=72

We move all terms to the left:

7n+5n-(72)=0

We add all the numbers together, and all the variables

12n-72=0

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

12n=72

n=72/12

n=6

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