20k-8k+k-9k-k=18

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Solution for 20k-8k+k-9k-k=18 equation: 



20k-8k+k-9k-k=18

We move all terms to the left:

20k-8k+k-9k-k-(18)=0

We add all the numbers together, and all the variables

3k-18=0

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

3k=18

k=18/3

k=6

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