3k-9=k+9

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Solution for 3k-9=k+9 equation: 



3k-9=k+9

We move all terms to the left:

3k-9-(k+9)=0

We get rid of parentheses

3k-k-9-9=0

We add all the numbers together, and all the variables

2k-18=0

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

2k=18

k=18/2

k=9

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