4k+k+4k-9k+3k=9

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Solution for 4k+k+4k-9k+3k=9 equation: 



4k+k+4k-9k+3k=9

We move all terms to the left:

4k+k+4k-9k+3k-(9)=0

We add all the numbers together, and all the variables

3k-9=0

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

3k=9

k=9/3

k=3

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