(9+k)4=80

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Solution for (9+k)4=80 equation: 



(9+k)4=80

We move all terms to the left:

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

We add all the numbers together, and all the variables

(k+9)4-80=0

We multiply parentheses

4k+36-80=0

We add all the numbers together, and all the variables

4k-44=0

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

4k=44

k=44/4

k=11

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