9(k)+12(7-k)=72

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Solution for 9(k)+12(7-k)=72 equation: 



9(k)+12(7-k)=72

We move all terms to the left:

9(k)+12(7-k)-(72)=0

We add all the numbers together, and all the variables

9k+12(-1k+7)-72=0

We multiply parentheses

9k-12k+84-72=0

We add all the numbers together, and all the variables

-3k+12=0

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

-3k=-12

k=-12/-3

k=+4

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