5n+7n=180

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Solution for 5n+7n=180 equation:



5n+7n=180
We move all terms to the left:
5n+7n-(180)=0
We add all the numbers together, and all the variables
12n-180=0
We move all terms containing n to the left, all other terms to the right
12n=180
n=180/12
n=15

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