9=12k-8-7k

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Solution for 9=12k-8-7k equation: 



9=12k-8-7k

We move all terms to the left:

9-(12k-8-7k)=0

We add all the numbers together, and all the variables

-(5k-8)+9=0

We get rid of parentheses

-5k+8+9=0

We add all the numbers together, and all the variables

-5k+17=0

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

-5k=-17

k=-17/-5

k=3+2/5

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