10k+9=7k

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Solution for 10k+9=7k equation: 



10k+9=7k

We move all terms to the left:

10k+9-(7k)=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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