-80=4-7k

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Solution for -80=4-7k equation: 



-80=4-7k

We move all terms to the left:

-80-(4-7k)=0

We add all the numbers together, and all the variables

-(-7k+4)-80=0

We get rid of parentheses

7k-4-80=0

We add all the numbers together, and all the variables

7k-84=0

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

7k=84

k=84/7

k=12

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