7k+8+7k-1+5k+2=180

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Solution for 7k+8+7k-1+5k+2=180 equation: 



7k+8+7k-1+5k+2=180

We move all terms to the left:

7k+8+7k-1+5k+2-(180)=0

We add all the numbers together, and all the variables

19k-171=0

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

19k=171

k=171/19

k=9

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