3(6+k)=81

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Solution for 3(6+k)=81 equation: 



3(6+k)=81

We move all terms to the left:

3(6+k)-(81)=0

We add all the numbers together, and all the variables

3(k+6)-81=0

We multiply parentheses

3k+18-81=0

We add all the numbers together, and all the variables

3k-63=0

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

3k=63

k=63/3

k=21

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