9(k-1)=72

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Solution for 9(k-1)=72 equation: 



9(k-1)=72

We move all terms to the left:

9(k-1)-(72)=0

We multiply parentheses

9k-9-72=0

We add all the numbers together, and all the variables

9k-81=0

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

9k=81

k=81/9

k=9

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